Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 11, Pages 15307-15312Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.02.094
Keywords
Laser lighting; Reflective configuration; Saturation threshold; Composite film
Categories
Funding
- National Natural Science Foundation of China, China [51802083, 51772076]
- Danish Energy Technology Development and Demonstration program, Denmark [EUDP 64017-0588]
- Natural Science Foundation of Fujian/Henan Province, China [2019J05022, 20A430018, 182300410193]
- Training plan of young backbone teachers in Colleges and Universities of Henan Province, China [2019GGJS060]
Ask authors/readers for more resources
In order to address the poor thermal/chemical performance of red phosphors in high-power laser lighting, all-inorganic CASNN-based phosphors have been developed to avoid the use of resin. A facile fabrication method was reported for CASN/glass composite films with high quantum efficiency and record high luminous efficacy. The composite film showed excellent properties in terms of color rendering, luminous efficacy, and saturation threshold in both high power and high power density modes.
To achieve high color rendering and proper color temperature, a red color converter is essential for phosphorconverted white lighting devices. CaAlSiN3:Eu2+ (CASN) is a highly suitable red phosphor for white lightemitting diodes. However, it can be hardly used in high-power laser lighting due to poor thermal/chemical performance of the phosphor/silicone resin mixture. A series of all-inorganic CASN-based phosphors (e.g., composite ceramic and phosphor-in-glass) were developed to avoid the use of resin. However, new challenges emerged: none of them showed sufficient luminous efficacy (i.e., >50 lm/W) and adequate saturation-threshold (i.e., >30 W or 10 W/mm2). Here, we report a facile fabrication of CASN/glass composite films using a simple and efficient blade-coating method. Upon 450 nm excitation, the resultant composite film presents a high internal quantum efficiency of -83%, comparable to that of pristine CASN powder (-90%). When irradiated with a blue laser, the composite film shows a record high luminous efficacy of 82 lm/W. Furthermore, its saturation threshold was investigated in high power and high power density mode, respectively. When measured in high power mode, it shows a high saturation threshold over 29.7 W (1.75 W/mm2), thus achieving a high luminous flux of 1576 lm; when measured in high power density mode, it shows a saturation threshold of -10.2 W/mm2 (1.13 W). With abovementioned excellent properties, the CASN/glass composite film has great potential for use in high-power and high color rendering laser lighting.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available