Tunable‐spectrum Mn2+ doped garnet transparent ceramics for high‐color rendering laser lighting

Laser diodes (LDs) packaged with transparent ceramics show the low thermal expansion coefficient and high thermal conductivity, but there is a problem of the low color render index (CRI) owing to the lack of red component in current transparent ceramics. Mn2+ doped garnet transparent ceramics with a...

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Bibliographic Details
Published inInternational journal of applied ceramic technology Vol. 18; no. 3; pp. 716 - 723
Main Authors Cao, Yangfei, Han, Tao, Yang, Jiayao, Peng, Lingling, Cao, Shixiu, Liu, Bitao, Tian, Zhongqing, Gao, Wei
Format Journal Article
LanguageEnglish
Published Malden Wiley Subscription Services, Inc 01.05.2021
Subjects
Ceramics
Color temperature
Electron clouds
Energy transfer
lasers
Luminous efficacy
photoluminescence
Pollution monitoring
Semiconductor lasers
Thermal conductivity
Thermal expansion
transparent ceramics
Vacuum sintering
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Summary:Laser diodes (LDs) packaged with transparent ceramics show the low thermal expansion coefficient and high thermal conductivity, but there is a problem of the low color render index (CRI) owing to the lack of red component in current transparent ceramics. Mn2+ doped garnet transparent ceramics with adjustable color from yellow to red have been prepared via a solid‐state reaction‐vacuum sintering process, which have a high transmittance of 78.6% at 800 nm. Two main emission peaks of this ceramic are monitored at 590 and 749 nm, and the gratifying luminous performance improvement is obtained due to the charge compensation effect, electron cloud expansion effect, and efficient energy transfer. LD system fabricated with the obtained ceramics and blue LD shows a high‐CRI of 80, low correlated color temperature of 4098 K, and good luminous efficiency of 96.91 m/W.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13685