LuAG:Ce/CASN:Eu phosphor enhanced high-CRI R/G/B LD lighting fidelity

By passing a collimated red/green/blue laser diode (R/G/B-LD) beam through a yellow-orange luminescent Lu 3 Al 5 O 12 :Ce 3+ /CaAlSiN 3 :Eu 2+ (LuAG:Ce/CASN:Eu) phosphor glass, divergent white light with a color rendering index (CRI) beyond 80 at a correlated color temperature (CCT) of 6500 K is obt...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2019, Vol.7 (31), p.9556-9563
Main Authors: Huang, Yu-Fang, Chi, Yu-Chieh, Cheng, Chih-Hsien, Tsai, Cheng-Ting, Wang, Wei-Chun, Huang, Ding-Wei, Chen, Li-Yin, Lin, Gong-Ru
Format: Article
Language:English
Subjects:
Cerium
Collimation
Color temperature
Diodes
Glass
Laser beams
Light
Optical communication
Phosphors
Photodegradation
Semiconductor lasers
White light
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Summary:By passing a collimated red/green/blue laser diode (R/G/B-LD) beam through a yellow-orange luminescent Lu 3 Al 5 O 12 :Ce 3+ /CaAlSiN 3 :Eu 2+ (LuAG:Ce/CASN:Eu) phosphor glass, divergent white light with a color rendering index (CRI) beyond 80 at a correlated color temperature (CCT) of 6500 K is obtained for visible light communication (VLC) beyond 10 Gbps. The CCT of white light is unique as it can be tuned by flexibly adjusting the R/G/B-LD power ratio. Thinning the LuAG:Ce/CASN:Eu phosphor glass to 0.8 mm greatly improves the transmission performance of the white light but inevitably degrades its CRI to 41.1 at a CCT of 6509 K. In contrast, a 1.0 mm thick phosphor effectively enlarges the CRI up to 80.4 at a CCT of 6560 K while reducing the red and blue power. The trade-off between the phosphor glass thickness and R/G/B-LD power is studied to optimize the cold-white-light CRI beyond 80 and the white-light VLC up to 10.4 Gbps. Phosphor thickness and R/B power were analyzed to optimize the cold-white-light CRI to 80.4 and white-light VLC to 10.4 Gbps.
ISSN:2050-7526
2050-7534
DOI:10.1039/c9tc01586h