作者：Blade

Seoul National University team develops flexible Micro LED connection technology

On June 6, a research team led by Yongtaek Hong, a professor in the Department of Electrical and Information Engineering at Seoul National University, announced that the team has developed a new technology to connect Micro LEDs to flexible and stretchable devices.

Seoul National University team develops flexible Micro LED connection technology

It is reported that the researchers used a dip-transfer coating technique to selectively pattern the adhesive precursor onto the surface of the micro device. The adhesive contains ferromagnetic particles that can be self-assembled into anisotropic chains using a magnetic field. This method can provide low contact resistance for device interconnection and no electrical interference between fine-pitch terminals.

In addition to being able to assemble flexible and stretchable Micro LED arrays, this technology can also be used to create a Micro LED display device that can be attached to the skin to detect human body temperature and visualize data on the display.

The research team explained that the new technology overcomes the problem of low elasticity and flexibility of electrodes and substrates caused by the harder properties of anisotropic conductive film materials, as well as the problem of low bonding stability caused by softer adhesives.

The research team said that using this new technology, the team integrated the micro IC driver and LED display unit into a flexible PCB, realizing an ultra-small wearable display and sensor system that is smaller than existing commercial micro IC chips.

The research team said that this new technology can systematically integrate high-performance microelectronic devices while maximizing the mechanical properties of flexible and stretchable systems. This technology will contribute to the commercialization of flexible displays.

It is reported that the research was supported by Samsung, and the research paper has been published in the academic journal Nature Electronics.

Emergency lighting towers help harvest wheat fields in Beizijing Village, Zhoucun Town, Dingzhou City, Baoding, Hebei

Recently, extreme weather such as high temperature and strong winds have occurred in many places in Hebei. Even in the middle of the night, the wheat fields are still rolling with heat waves.

Emergency lighting towers help harvest wheat fields in Beizijing Village, Zhoucun Town, Dingzhou City, Baoding, Hebei

Power outages, electricity testing, installation of grounding wires and fences, hanging signs… At 0:10 on June 12, in the wheat fields of Beizijing Village, Zhoucun Town, Dingzhou City, Baoding, Hebei Province, Li Qiang, Wang Weifeng, and Liu Qiang, employees of Zhoucun Power Supply Station of Baoding Dingzhou Power Supply Company, were arranging safety measures and preparing to carry out “zero-point operations”. They will use the low-power period at night to eliminate defects in the distribution transformer of the 11th area of Beizijing Public Agriculture on the 10kV Qiantun Line.

At this moment, at the other end of the wheat field, two farmers drove electric tricycles along the field road quickly, followed by a harvester. Seeing the anxious look of the farmers, Li Qiang, the person in charge of the construction site work, hurried to meet them. After talking, it was learned that the farmers were Duan Lishuang, a villager of Beizijing Village, and his wife.

“The weather has changed too fast recently. It was sunny in the morning, but it started to flash and blow in the evening. The wheat is ripe and waiting to be harvested, but I am afraid that it will suddenly blow and rain.” Duan Lishuang said that he felt very uneasy when he saw the weather changing. It is the busy season for summer harvest. Large areas of wheat are ripe and waiting to be harvested, and the “reservations” of harvesters are tight. On the evening of June 11, Duan Lishuang saw that the weather was bad and worried that rain would affect the wheat harvest, so he hurriedly contacted the harvester and planned to rush to harvest at night. However, there were too many people waiting in line, and it was not until the early morning that it was his turn.

While Li Qiang and Duan Lishuang were talking, the harvester had slowly landed. Due to the limited illumination range of the harvester’s built-in lighting, the harvesting progress was slow.

Rush to harvest wheat is a race against time and weather. Looking at Duan Lishuang who was always worried, Li Qiang had an idea in his mind: “Don’t worry, I’ll ask my colleagues to send two emergency lighting equipment.”

Five minutes later, the repair vehicle carrying two emergency lighting towers arrived at the scene. Seeing the two “huge monsters”, Duan Lishuang curiously approached.

The lamp heads of these two emergency lighting towers can be automatically raised, and the lighting direction can be adjusted 360 degrees. Li Qiang turned on the control switch, raised the equipment bracket, adjusted the direction of the lighting, and pressed the start button. The two emergency lighting towers instantly lit up the wheat field.

With good lighting conditions, the harvesting speed of the harvester was significantly accelerated, and Duan Lishuang was relieved. At the same time, the work of eliminating defects in the equipment also began. Under the night sky, in the brightly lit wheat fields, the “double rush” scenes of summer grain harvesting and power equipment “eliminating defects” were intertwined.

After 30 minutes, the harvesting work was completed and the wheat was successfully loaded. Duan Lishuang held Li Qiang’s hand and said, “It’s going to rain, and I’m so anxious! Fortunately, I met you today, you are so awesome!”

The harvester slowly drove out of the wheat field, and the farmers returned with a full load with smiles, and the wheat field returned to silence. The lights were still shining quietly, and the work of eliminating equipment defects was still proceeding in an orderly manner.

The night lights of Changqingli Cultural Tourism Block in Changzhou, Jiangsu Province are officially lit up

The night of the Economic Development Zone of Changzhou City, Jiangsu Province, is a colorful picture scroll, with flashing neon lights outlining the outline of the city; the hustle and bustle of traffic interweaves into a flowing river of light.

The-night-lights-of-Changqingli-Cultural-Tourism-Block-in-Changzhou,-Jiangsu-Province-are-officially-lit-up

The lighting of Changqingli undoubtedly adds a new touch to this picture scroll. With the full presentation of the street scene of Changqingli Cultural Tourism Block, the lights of the block have also been officially lit up.

As night falls, Changqingli is decorated with lights, colorful and unique, and it “groups” with Oriental Cloud Lake and Cultural Activity Center to become the most beautiful night view of oriental new city.

“Since the Changqingli lighting project was launched in September last year, a total of various lighting facilities such as LED photoelectric glass, wall washers, floodlights, water pattern lights, landscape lights, and underground lights have been installed.” Xu Zhengyu, the person in charge of the block lighting project, introduced.

“Focusing on the three goals of Dragon IP space identification, high-quality commercial blocks and smart + ecological parks, Changqingli aims to create a poetic and rhythmic light and shadow painting, and create a comfortable business environment through modern lighting technology and innovative design concepts.”

Looking down from the air, Changqingli seems to be wearing “new clothes”. Under the outline of the wall-washing lamps, the overall lighting of the block is uniform and soft, “seeing the light but not the lamp”.

The architectural shape is more prominent. Under the “dressing” of the lights, the block is simple and prosperous without losing the fashionable technology, like a visual feast!

Intelligent street lights in Suzhou-Chuzhou High-tech Zone, Chuzhou, Anhui

With the continuous improvement of the level of smart urban management, it is quietly affecting our lifestyle and urban appearance. In order to comprehensively improve the refinement and intelligence of the management of public lighting facilities in the Zhongxin Suzhou-Chuzhou High-tech Zone in Chuzhou City, Anhui Province, Suzhou-Chu Municipal Utilities actively explored new energy-saving paths and carried out the construction of smart street lights in the park.

Intelligent street lights in Suzhou-Chuzhou High-tech Zone, Chuzhou, Anhui

Since September this year, Suzhou-Chuzhou Municipal Utilities Company has upgraded and renovated the public lighting facilities on the main and secondary roads of the park for energy saving and intelligent management and control, with a total investment of about 11 million yuan. Mainly installed about 7,000 sets of single lamp controllers and 102 sets of centralized managers, replaced about 2,400 dimming drive power supplies, and replaced more than 3,500 old high-pressure sodium lamps in the park with new LED lamps with high light efficiency and low color temperature.

At the same time, a digital management system for smart street lights has been built. Through the system, you can directly view the type, quantity, location, operating status, lighting rate and other information of street lights, and the park street lights can achieve “one picture, visualization” management and control. The system has a remote control function. Managers can check the operation of street lights anytime and anywhere through mobile phones or computers, and adjust the disposal according to the actual situation, which greatly improves work efficiency and management level. The system can not only monitor the working status of each street light in real time, but also automatically adjust the brightness according to the changes in ambient light, ensuring that it meets the nighttime lighting needs while avoiding excessive consumption of electricity.

Lanzhou University researchers develop highly efficient phosphor for high-power laser-driven lighting

Lanzhou University Wang Deyin@Wang Yuhua LPR replaced the Al3+-Al3+ pairs in BaLu2Al4SiO12: Ce3+ with Mg2+-Si4+ pairs to prepare a new blue-light-excitable yellow-emitting phosphor BaLu2(Mg0.6Al2.8Si1.6)O12: Ce3+, with an external quantum efficiency (EQE) of 66.2%. While Ce3+ emission red-shifted, this substitution also broadened Ce3+ emission and reduced its thermal stability. The change in the spectrum is due to the change in the local crystal field of Ce3+ and the change in positional symmetry caused by the Mg2+-Si4+ substitution.

Lanzhou University researchers develop highly efficient phosphor for high-power laser-driven lighting

In order to evaluate the feasibility of the newly developed yellow-emitting phosphor for high-power laser lighting, it was constructed as a phosphor wheel. Under the irradiation of a blue laser with a power density of 90.7 W mm2, the luminous flux of the yellow phosphor was 3894 lm, and there was no obvious emission saturation phenomenon. The yellow phosphor wheel was excited by blue laser diodes (LDs) with a power density of 25.2 W mm?2, generating bright white light with a luminance of 1718.1 lm, a correlated color temperature of 5983 K, a color rendering index of 65.0, and color coordinates of (0.3203, 0.3631).

These results indicate that the newly synthesized yellow-emitting phosphor has significant potential for high-power laser-driven lighting applications.

The night scene lighting along the Yan’an Road Elevated Road in Shanghai has been upgraded again

As a backbone traffic artery that runs east-west across the central urban area of Shanghai, the Yan’an Road Elevated Road is an extremely important part of Shanghai’s urban night scene. Since 2022, after three years of construction, the night scene along the Yan’an Road Elevated Road has a certain scale and influence. The third phase of the Yan’an Road Elevated Road project creates a warm, elegant, prosperous and fashionable night city light environment through new construction, renovation, upgrading and retention, further enhancing the night scene image of the main axis of Jing’an District “Excellent Huaguang, Brilliant Jing’an”.

The night scene lighting along the Yan'an Road Elevated Road in Shanghai has been upgraded again

Large-scale group design, star-studded night scene lighting

After multiple on-site surveys and analyses, the area around the Huashan Road ramp, the Yan’an Road Elevated Road and the ground municipal roads are all areas with relatively serious traffic congestion. At the same time, the Huashan Road overpass has a relatively wide field of vision, and the line of sight basically overlaps with the elevated driving line of sight. Therefore, the buildings around the skybridge are used as carriers, and the large-scale group design is carried out. The highlights are highlighted by combining the characteristic elements of the buildings in some parts, and the overall coordination of the surrounding lighting is rationally planned to create a representative model of Shanghai’s urban night scene.

Iconic and exquisite design, outstanding and dazzling night scene lighting

Jiadi Center and Wenxin News Building are two buildings with upright shapes and distinct architectural features, occupying important positions in their respective areas. Lighting focuses on fine depiction according to its own functional attributes and architectural element characteristics to create an iconic night scene in a small area. Jiadi Center is located at No. 968, Beijing West Road, a prime location in Jing’an District. It is a unique high-rise fashion landmark. Its architectural design style is modern and full of elegant temperament, standing out among the high-rise buildings. Whether driving on the Yan’an Road Elevated Road or the North-South Elevated Road, or along the Suzhou River, you can see it. The night scene lighting focuses on the shape of the “crown” on the top of the building, making it more dazzling.

The Wenxin News Building is 170 meters high and is close to the Yan’an Road Elevated Road. When driving on the Yan’an elevated road, whether traveling from east to west or from west to east, the Wenxin Newspaper Building occupies the center of vision for a long time. The lighting uses linear lighting techniques to highlight the main body of the building, emphasizing its uprightness and creating a small-scale iconic night view building.

The second phase of the green energy-saving and intelligent innovation and transformation project in Baotou, Inner Mongolia has been officially completed

Good news! The second phase of the 2024 Baotou City Street Light Green Energy-saving and Intelligent Innovation and Transformation Project, which was implemented by the Municipal Affairs Development Center of the Baotou City Administration Bureau of the Inner Mongolia Autonomous Region, was fully completed a few days ago. The street lights under the jurisdiction of the Municipal Affairs Development Center have officially entered the “sodium-free era”.

The second phase of the green energy-saving and intelligent innovation and transformation project in Baotou, Inner Mongolia has been officially completed

The main implementation content of the second phase of the project is to transform a total of 5,280 sets of original sodium lamps on 29 roads throughout the city, including Qingshan Road, Tuanjie Street, Bayantala Street, Jian’an Street, and Century North Road, into LED modules. The project arranged a total of 30 professional and technical personnel and mobilized 5 aerial vehicles to work simultaneously. Under the premise of ensuring construction safety and quality, the construction personnel reversed the construction schedule, accelerated the transformation speed, and ensured the project was completed ahead of schedule.

After the completion of this project, all 11,125 high-pressure sodium lamps under the jurisdiction of the Municipal Development Center have been renovated, and the outstanding problems of the original sodium lamps (high power consumption, high operation and maintenance costs, high failure rate, low road illumination, low color rendering index, and low light uniformity) have been effectively improved. Compared with 2021, after the completion of this renovation of all street lamps, it is estimated that 2.43 million yuan in electricity bills will be saved each year, and carbon emissions will be reduced by about 5,026 tons each year, helping Baotou City achieve its “dual carbon” goals.

Sports facilities in Chengbei Park in Nanchong, Sichuan Province are fully lit

At about 7 p.m. on September 10, the reporter saw that citizens came to Chengbei Park in Nanchong City, Sichuan Province to play basketball, run or exercise with fitness equipment.

At 7:30 p.m., the four high-pole lights in the park were lit on time. When the lights are on, the basketball court, football field, track and field, and badminton courts have a very ideal lighting effect in the night. Citizens no longer need to “find in the dark” when they go out at night, and security guards no longer need to use flashlights when patrolling.

Sports facilities in Chengbei Park in Nanchong, Sichuan Province are fully lit

When the reporter interviewed earlier, only a few people in the basketball court were practicing shooting under the lighting of mobile phones. This time, two teams are playing freely on the court.

“Chengbei Park started to light up the lights on the evening of September 9.” A citizen who played basketball told reporters that in order to avoid the high temperature, everyone could only come to play basketball in the evening and leave after dark. After learning that the park was lit up, they made an appointment to play basketball in the park at night.

The reporter noticed that, except for the basketball court, football field, track and field, and badminton court, other areas of the park, including the children’s playground, are not lit yet, making it inconvenient for night tours.

At around 9 p.m., the security guards reminded the citizens to leave the park in time through the loudspeaker. At 9 p.m., all four high pole lights were turned off.

Zeng Huilin, deputy director of the Shunqing District Park Affairs Center, introduced that some areas of Chengbei Park have been opened. For areas that have not yet been opened, the center is urging the construction party to install the relevant supporting facilities as soon as possible so that the park can be fully opened as soon as possible. By then, the park’s night lighting facilities will be turned on for a long time to fully guarantee citizens’ nighttime park tours.

“At present, the basketball court, football field, and badminton court are all open to the public free of charge.” Zeng Huilin reminded citizens that before the park’s night lighting facilities are fully turned on, please do not go to the insufficiently lit areas to avoid safety accidents. During the visit, please cooperate with the management of the Park Affairs Center and leave the park in time before the lights are turned off.

More than 4,000 street lamps in Jianyang District, Nanping, Fujian Province are equipped with the “strongest brain”

In the early morning, the floodlights on the 275 new Chinese lanterns on Jianping Avenue in Jianyang District, Nanping City, Fujian Province suddenly turned off, the bright moon was shining in the sky, and the surrounding environment fell into a quiet.

More than 4,000 street lamps in Jianyang District, Nanping, Fujian Province are equipped with the "strongest brain"

Wu Xun, a staff member of the Municipal Service Center: “We use the ‘smart street lamp’ system to adjust the lighting time of the floodlights on the Chinese lanterns on Jianping Avenue to 18:20 to 00:00, that is, to turn them off with one click in the second half of the night when there is less traffic, which not only ensures night lighting but also saves energy.”

The Jianyang District Urban Management and Comprehensive Law Enforcement Bureau firmly establishes the concept of high-quality urban development centered on the people, scientifically and rationally plans and layouts, improves functions to highlight care, accelerates the energy-saving transformation of urban “smart street lamps”, and strives to create a harmonious and beautiful urban night scene, creating a new engine and injecting new momentum to drive the growth of the “night economy”, and constantly meeting the people’s growing needs for a better life.

Small street lights in Xinxiang, Henan Province illuminate the people’s livelihood

As night falls, Hongzhou Township, Huixian County, Xinxiang City, Henan Province is brightly lit. Under the street lights, there are bursts of laughter and children’s play. People gather in groups of three or five in the square, singing and dancing, creating a new scene of joy and peace in the countryside. This change is due to the effect of centralized rectification.

Small street lights in Xinxiang, Henan Province illuminate the people's livelihood

Since the launch of the special action of centralized rectification, Hongzhou Township has vigorously carried out activities to collect urgent and difficult problems of the masses, divided the whole township into 35 grids, and the cadres of the organs visited the grids to establish a full-staff responsibility system. Through the visit, it was learned that “since the opening of Hongzhou Township Community Street, namely the Hongzhou section of S311, due to many factors, street lights have not been installed on this section, resulting in difficulties for local villagers and students of the central school to travel at night, and safety cannot be effectively guaranteed.” After that, the Party Committee organized a research and judgment meeting and included the problem in the list of urgent and difficult problems of the masses. Immediately After a lot of communication and coordination, more than 100,000 yuan of funds for the purchase of street lights were raised. The working group members went from village to village, solicited opinions from residents, schools, shops and enterprises along the road, surveyed the locations of the entire road section, determined the quantity, and estimated the cost, formulated an installation plan, studied the feasibility of street light installation, and increased the number of street lights near the central school. During the installation, the staff worked day and night, closely monitored the manufacturer’s delivery progress, stood guard in the middle of the night waiting for delivery, inspected the quality of the street lights, and manually moved and placed them one by one. 56 solar street lights were successfully completed and put into use in just three days, covering more than 1,600 meters of roads, which not only solved the safety hazards of people’s night travel, facilitated vehicles to drive at night, but also improved the overall image of Hongzhou Township.

Combined with the “four deep and four clear” work, through further comprehensive investigation, it was found that Xitulou Village and Sili Miao Village had problems such as aging and damage of street lights, which affected the production and life of the people. To this end, the Party Committee and Government of Hongzhou Township urged the two villages to implement the street light renewal project. Xitulou invested more than 90,000 yuan to install 58 new solar street lights; Sili Miao invested more than 30,000 yuan to replace 110 solar street lights. With the active cooperation of the two villages, the street lighting project was rapidly promoted. It took only one month from fundraising to installation. We coordinated with relevant departments and communities to discuss solutions, set up a working group, and assigned special personnel to follow up the whole process to fully promote the “road lighting” action.