Improved thermal quenching of Y3Al5O12:Ce phosphor ceramics with silica addition
| Autor: | Jyun-Kai You, Yung Tang Nien |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Analytical chemistry Phosphor 02 engineering and technology 01 natural sciences law.invention law 0103 physical sciences Materials Chemistry Thermal stability Ceramic 010302 applied physics business.industry Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Thermal conduction Microstructure Mechanics of Materials visual_art visual_art.visual_art_medium Optoelectronics Quantum efficiency 0210 nano-technology business Light-emitting diode |
| Zdroj: | Journal of Alloys and Compounds. 678:1-4 |
| ISSN: | 0925-8388 |
| Popis: | Y 3 Al 5 O 12 :Ce (YAG:Ce) is widely used in light emitting diodes (LEDs) for the conversion of blue light into yellow light. However, thermal quenching has become a severe problem for high-power LEDs because more heat is generated by high-power LED chips; this results in the reduction of emission intensity and unit life. In this research, silica was fired with co-precipitated YAG:Ce phosphor ceramics to study the photoluminescent thermal quenching behavior by comparing with pristine YAG:Ce. The results showed that silica-added YAG:Ce phosphor ceramics exhibited an increase of more than 15% in quantum efficiency and a higher thermal quenching temperature compared with pristine YAG:Ce. This improvement in thermal stability (10% increase at 150 °C) in silica-added YAG:Ce phosphor ceramics was attributed to a denser microstructure and an increase in thermal activation energy by Si substitution of Al in the host. |
| Databáze: | OpenAIRE |
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