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Eu 3+ ‐doped glass as a color rendering index enhancer in phosphor‐in‐glass
Author(s) -
Orozco Hinostroza Ignacio E.,
Desirena Haggeo,
Hernandez Jose,
Molina Jorge,
Moreno Ivan,
De la Rosa Elder
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15464
Subject(s) - phosphor , color rendering index , color temperature , europium , materials science , light emitting diode , doping , analytical chemistry (journal) , common emitter , diode , optoelectronics , luminescence , optics , chemistry , physics , chromatography
A new method for improving color rendering index ( CRI ) and low correlated color temperature ( CCT ) in high‐power white‐light‐emitting diodes ( WLED s) is proposed. We used a configuration of phosphor‐in‐glass ( PIG ) and studied light output changes with the increment in concentration of yellow‐emitting Y 3 Al 5 O 12 :Ce 3+ ( YAG :Ce 3+ ) phosphor. The PIG was coupled on the top of blue‐light‐emitting diodes ( LED ) chip (465 nm). To compensate the lack of red emission in the phosphor, Eu 3+ ‐doped tellurium glass with different europium content was employed as a red emitter. The suitable contents of YAG :Ce 3+ and Eu 3+ were 7.5 weight percent (wt%) and 3 mol percent (mol%), respectively. The CRI value went from 72 to 82, whereas the CCT was reduced from 24 933 to 6434 K. The proposed structure can improve CCT as well as CRI of WLED s just by placing a glass on top.