In:
Journal of the American Ceramic Society, Wiley, Vol. 106, No. 10 ( 2023-10), p. 5933-5943
Abstract:
In this work, a series of Al 2 O 3 –Ce:YAG phosphor powders were synthesized by regulating the excess Al 3+ of (Y,Ce) 3 Al 5 O 12 via coprecipitation method for the first time, where Al 3+ , Ce 3+ , and Y 3+ elements were uniformly distributed. With the increase of Al 3+ content, the morphology of the powders changed from wormlike shapes to flaky shapes, and Y 3 Al 5 O 12 phases had a tendency to convert to YAlO 3 phases. The x wt.% Al 2 O 3 –(Y 0.999 Ce 0.001 ) 3 Al 5 O 12 ( x = 20, 30, 40, 50, 60, and 70) composite phosphor ceramics (CPCs) were obtained by vacuum sintering (1775°C × 10 h), where Al 2 O 3 and Ce:YAG phases were also well‐distributed. When the Al 2 O 3 content was 30–40 wt.%, the average grain size of Al 2 O 3 was close to that of Ce:YAG. A solid‐state laser lighting device was constructed by a 450 nm laser source and CPCs in a reflection mode. By adjusting the laser power, the correlated color temperature (CCT) values of white laser diodes (LDs) were achieved close to the standard white light of 6500 K. Impressively, the white LDs equipped with the 40 wt.% Al 2 O 3 ‐containing CPCs showed the optimum CCT of 6498 K (color coordinates: 0.31 and 0.38), as well as a high luminous flux of 1169 lm and efficiency of 166 lm/W at the LD power of 7.05 W. This work has provided a potential idea to optimize the composition uniformity of Al 2 O 3 –Ce:YAG CPCs as also to explore their excellent performance in the application of white laser lighting.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.v106.10
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
