High-efficiency YAG:Ce3+ glass-ceramic phosphor by an organic-free screen-printing technique for high-power WLEDs
| Autor: | Qian Shi, Yunhao Liang, Libin Xia, Chengyue Li, Yijun Zhuang, Yang Fu, Chuanlong Liu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Phosphor 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry law Transmittance Thermal stability Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy Diode Glass-ceramic business.industry Organic Chemistry Doping 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Screen printing Optoelectronics Quantum efficiency 0210 nano-technology business |
| Zdroj: | Optical Materials. 107:110118 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2020.110118 |
| Popis: | Y3Al5O12:Ce3+ glass-ceramic phosphor (YAG-GC), as a high thermal stability material, provides an efficient way to resolve the aging of phosphor-converted white light-emitting diodes in the high-power field. In the present work, transparent YAG-GCs are successfully prepared via a novel organic-free screen-printing route. The results reveal that the degradations of YAG phosphors are negligible in the as-prepared glass ceramic material. Favorable transmittance is achieved and the value is near 50%. The PL spectra intensities of YAG-GCs increase with increasing YAG doping concentration and film thickness. Superior thermal stability (87.9% of the initial value at 150 °C) and high quantum efficiency of 88.91% (decreased only 2.33% compared with the YAG raw materials) are obtained. The LE of YAG-GCs increases, while the CCT and CRI decrease with increases in film thicknesses and YAG doping concentrations. A high LE of 150.1 lm/W and an acceptable CCT of 5836 K, a CRI of 67.6 are achieved in YAG-GCs. All the results indicate that the as-prepared YAG-GCs are promising candidates in the field of high-power WLEDs. |
| Databáze: | OpenAIRE |
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