Ask for a reprint
email :
2024
ACL
|
J.Fu, S.Feng, C.Genevois, E.Véron, Y.Yang, H.Wang, Z.Ma, L.Bai, W.Xu, R.Fan, C.Wang, M.Allix, J.Li, 'Green-emissive Ce3+:Lu3Al5O12–Al2O3 nanoceramics elaborated via glass crystallization for high-power laser lighting applications', J. Mater. Chem. C 12 7188 (2024) doi:10.1039/d4tc00616j
Transparent Ce:Lu3Al5O12 (Ce:LuAG) phosphor ceramics are regarded as the most promising green color
conversion materials in the next-generation of laser diode (LD) lighting. However, the insufficient
scattering of incident blue laser and poor heat quenching seriously prevent the application of
transparent Ce:LuAG phosphor ceramics in high-quality LD-driven lighting, especially at high input
power density. In view of this, a biphasic Ce:LuAG–Al2O3 green phosphor ceramic is proposed in this
study. Using an excessive Al2O3 component design strategy, the Al2O3 secondary phase is in situ generated
in the resulting ceramic material via the full bulk glass crystallization method. The in situ generated
Al2O3 secondary phase can serve as a light scattering center and has good thermal conductivity. Therefore,
the luminescence properties and thermal stability of transparent Ce:LuAG–Al2O3 phosphor ceramics
are greatly enhanced compared to Ce:LuAG. An ultrahigh luminous flux (LF) of 5124.7 lm and an
excellent luminous density of 4235.5 lm mm2 are achieved in LD-driven lighting under 450 nm high
power density laser excitation (29.83 W mm2), which has been almost the best performance of transparent
Ce:LuAG ceramics in LD lighting to date. A maximum luminous efficiency of 247.9 lm W1
(4.38 W mm2) is also obtained. These results demonstrate that the transparent Ce:LuAG–Al2O3 nanoceramics
prepared in this work are promising green-emitting color converters to achieve highbrightness
and excellent luminous density for high power LD lighting. The excessive Al2O3 component
design strategy could also further drive the development of garnet-based transparent ceramics in the field of high-power LD lighting.
|
|