Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 1, Pages 343-347Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.07.036
Keywords
Luminescence saturation; Thermal quenching; Laser diode; LuAG:Ce
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Funding
- National Natural Science Foundation of China [51202060]
- Scientific Research Staring Foundation of Henan Polytechnic University [B2017-58]
- Program for Innovative Research Team of Henan Polytechnic University [T2017-2]
- Marie Curie International Incoming Fellowship (Return Phase) of the European Community Human Potential Program [PIIFR-GA-2013-913847]
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The aim of this study is to investigate a thermally robust green-yellow color converter for high-power solid state laser lighting applications. LuAG:Ce translucent ceramics (TCs) were synthesized via the spark plasma sintering (SPS) technique and LiF was used as additive. The as-prepared ceramics show remarkably superior thermal and luminescent properties: a high external quantum efficiency (77%), a low thermal quenching (4.1% drop at 200 degrees C), a good thermal conductivity (6.3 W m(-1) K-1), and a high reliability (only a 1.9% drop after 1000 h, at 85 degrees C and 85% humidity). A prototype lamp using the TC (and a 450 nm laser diode), with the increasing driving power (up to 8.7 W), shows increasing luminous flux (238-472 lm) with stable luminous efficiency (54.3-56.6 lm/W). This indicates that the translucent ceramic can be used for high-power laser-lighting.
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