标签：LED chips

The heat dissipation problem of LED chips cannot be solved easily

In the last few years, LED manufacturers positively develop high-brightness LED chips, treating the corresponding market as full of potentials and opportunities. The basic concept is enabling LEDs to work under high current to generate brighter light. According to current specifications, a LED chip with an area of 30um2 can withstand the maximum current of 30mA, which cannot meet the requirements of having LEDs generate larger luminance. In accordance with the expectation of the market, a LED chip with an area of 1mm2 can withstand the maximum current of 350mA. So that single-chip LEDs could generate higher internal quantum efficiency. Supposed the driver current is 3 volts, after calculation, there will be nearly 1W power that flow into LED chips every second.

 

The heat dissipation problem of LED chips cannot be solved easily

 

However, simply increasing the current cannot solve the problem fundamentally. Normally, about 3/4 inflow electricity will be wasted and convert into thermal energy. In another word, only 1/4 (0.25W) electrical energy will convert into optical energy. Troubles caused by the thermal effect usually exerted bad influence on LED lighting applications. LEDs will change the wavelength with the variation working temperature. Working in high temperature for a long time will reduce the luminous efficiency and CRI.

 

Theoretically, if the luminous efficiency of blue-ray LED chips can reach up to 360lm/W, along with high-level packing capabilities, it is not really difficult to obtain a 100lm/W white-ray output. It would not be a big issue with today’s LED technology. Many large international LED manufacturers have successfully developed high-brightness blue-ray LED chips, including CREE and Nichia. Now the really bottleneck is how effectively reduce the external quantum efficiency loss, which will test the ability of packaging industry.

 

On the other hand, the thermal effect caused by the increasing of input current is a very serious problem that needs to be solved urgently. Basically, reducing thermal impedance and improving heat dissipation is a generally direction for designers and producers. The current solution is reducing the thermal impedance of LED Panel Light chips, limiting the thermal impedance of control modules and printed circuit boards, increasing the heat dissipation effect of LEDs. Typically, manufacturers tend to choose materials with lower thermal impedance and good thermal conductivity. But in the mean time, size and weight are also two important factors that need to be taken into account.

The customization of LED chips makes LED lighting devices more popular among ordinary buyers

The latest market data shows that, the retail price of LED bulbs in America has dropped to 8 USD, and the retail price of LED tubes has dropped to around 5 USD as well. In consideration of the much lower selling prices, consumers are more likely to buy LED lamps. It is estimated in 2015, the global LED lighting market will usher a rapid development.

 

The customization of LED chips makes LED lighting devices more popular among ordinary buyers

 

But in the meanwhile, some experts believed that the growth of LED general lighting market will exceed people’s expectation. According to MR. Fang Lezhang from CrpowTech Co., Ltd., with the sharp price dropping of LED lighting products, the household application market is about to take off. The estimated growth rate of it is about 30%. In his point of view, the actual growth will be greater than this. Especially for the mainland LED lighting market, the estimated growth could be more than 50%. The current average ex-work price of LED lights has dropped to $1.38/each. This is no price barriers to keep them away from household furniture market. In 2013, there will be a large number of consumers try to adopt LED lighting products in their home. If LED lighting technology could keep on progressing at such speed, there will be a large number of procurement in 2014.

 

LED lighting is a large market that should not be ignored by large LED enterprises. In the past, the lacking of fund and design capabilities slowed down the developing rate of domestic LED chip manufacturers. In fact, today, many foreign companies started to shift their attention on customer-made LED chips, which create large design space for LED lighting applications. Unfortunately, the development of Chain’s LED industry is still in a very early stage: standardized products increase the intense of competitions in the market, reduce the gross margin. For customized LED High Bay Light chips used in specially applications, namely the simulated ASic chips, the gross margin is much higher. In 2011, the entire simulated LED chips market output is approximately 40 billion dollars, in which more than 90% is from customized market. Therefore, customer-made chips became a large market target for many international manufacturers of LED chips.

 

In order to meet the requirements of special LED lighting applications, LED makers need to have long-term sustainable developing strategy and strong design capabilities. They need to improve their service capabilities continuously, providing practical solutions and products for their clients.