The Xinjiang Normal University research team has made new progress in the research of highly thermally stable cyan phosphor for white LEDs

Recently, the Mineral Luminescent Functional Materials and Devices Innovation Team led by Professor Erken Sticky from the School of Physics and Electronic Engineering of Xinjiang Normal University published an article in the international academic journal Ceramics International (JCR Zone 1, Top Journal of Materials Science, IF: 5.2) Published 3 academic papers in a row, titled "Development of novel Eu2+ and Li+ Co-doped cyan-emitting aluminosilicate phosphors" and "Preparation of novel KAlSiO4: Ce3+ broadband cyan-emitting phosphors via partial cation substitution for applications in white-light LEDs" ", "Preparation and luminescence properties of Ba0.92-xSrxAl2Si2O8:0.08Eu2+blue-cyan phosphors for white light LEDs". The corresponding authors are all Professor Erken Stik, 2021 doctoral student Reziwanguli Yantak and 2021 graduate student Halizati Ablimiti are the first authors, and Xinjiang Normal University is the first author. One completed unit. The cyan phosphor prepared by this research group through the above three works achieves the purpose of two-color white light emission, simplifies the LED preparation process, and proves that they have good application prospects in the future WLEDs lighting field.

Work one

A series of KAlSiO4:x Eu2+, y Li+ cyan phosphors were prepared using a high-temperature solid-state method; the incorporation of 10% Li+ can control the emission color of the representative sample from blue cyan light to cyan light emission; the quantum yield increased from 71.5% to 93.3%; the emission intensity at 150°C increased from 75.9% of room temperature to 92.7% of room temperature; the color rendering index (Ra) of the white LED device increased from 82 to 95 respectively.

(a) Emission spectrum of KAlSiO4:0.02Eu2+, y Li+ phosphor; (b) EL spectrum of WLED device prepared using representative sample

Work 2

A series of K1-xAlSiO4:xCe3+ cyan phosphors were prepared using a high-temperature solid-state method; after incorporating Ce3+, the sample has a wide emission band that can cover blue and green areas; the average half-maximum width is around 130nm; representative samples are The luminous intensity at 150°C is 91.1% of room temperature; the results are combined with the DFT calculation results to determine that the above materials have good thermal stability and rigidity; the color rendering index of the LED devices exceeds 90.

(a) Temperature-changing spectrum of K0.96AlSiO4:0.04Ce3+ phosphor; (b) EL spectrum of WLED device driven by 60 mA current

Work three

Ba0.92Al2Si2O8:0.08Eu2+ and Ba0.92-xSrxAl2Si2O8:0.08Eu2+ (x=0~0.5) phosphors were prepared through high-temperature solid-state method and cation substitution strategy. The concentration of Sr2+ was changed to achieve phase change, and Ba0.92Al2Si2O8 : The luminous intensity of 0.08Eu2+ is 10.33 times; the luminous intensity of the representative sample at 150°C is 91.3% of room temperature, and has high thermal stability; the Ra of the white LED device is 87, and the color temperature is 3759 K.