Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 445, Issue -, Pages 77-80Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2016.05.011
Keywords
Glass; Phosphor; LED; Color rendering index; Thermal conductivity
Funding
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2013R1A1A2005671]
- National Research Foundation of Korea [2013R1A1A2005671, 22A20130012589] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Phosphor in glasses (PiGs) were fabricated for color tunable white LEDs using glass of the SiO2-B2O3-ZnO-Na2O system, which can be sintered at 550 degrees C. CaAlSiN3:Eu2+ (CASN:Eu2+) red phosphor was added without its thermal degradation, and a mixture with Y3Al5O12:Ce3+ (YAG:Ce3+) yellow phosphor demonstrated color tunable white LEDs when mounted on a blue LED. Variation of the glass to phosphor and phosphor to phosphor mixing ratio achieved a highly improved color rendering index (CRI), of up to 93. Thermal quenching property was also improved, reaching 98% of its original intensity even at 200 degrees C; the value depended on the phosphor content. Thermal conductivity values elucidate the improvement. (C) 2016 Elsevier B.V. All rights reserved.
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