Journal
IEEE PHOTONICS JOURNAL
Volume 13, Issue 3, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2021.3072029
Keywords
White light-emitting diodes (WLEDs); phosphor-in-glass (PiG); color rendering index (CRI); correlated-color temperature (CCT); wet-type cold isostatic pressing (CIP)
Funding
- Ministry of Science and Technology of Taiwan (MOST) [109-2218-E-005-012, 108-2218-E-005-018, 107-2218-E-005-025]
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The high CRI and wide CCT range of WLEDs were achieved using a wet-type cold isostatic pressing technique, which relied on optimized phosphor materials and precise adjustment of PiG thickness.
High color rendering index (CRI) of 97 and wide correlated-color temperatures (CCTs) range of 2100-7600 K in white light-emitting diodes (WLEDs) employing the two-inch diameter of CaAlSiN3: Eu2+ (red phosphor) and Lu3Al5O12: Ce3+ (green phosphor) co-doped phosphor-in-glass (PiG) are demonstrated by a novel wet-type cold isostatic pressing (CIP) technique. The wet-type CIP enable to apply isostatic pressure to a powder sample in all directions to obtain the PiG with excellent optical properties, high reliability, and thermal stability. The high CRI of 97 and the wide CCTs range of 2100-7600 K achieved are mainly due to the optimized phosphor materials and the precise adjustment thickness of the PiG. Based on the best formula of two-inch diameter PiG and a unique process of wet-type CIP, we have successfully fabricated and demonstrated the good uniformity and excellent performances of a large diameter of two-inch PiG. The proposed of a large diameter of two-inch PiG with excellent performance, high reliability, and thermal stability is essential to meet the economic dimension requirement for commercial usages in high-quality WLEDs indoor lighting applications.
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