Composition and luminescence properties of highly robust green-emitting LuAG:Ce/Al ₂O ₃ composite phosphor ceramics for high-power solid-state lighting

Abstract

The major advantage of laser lighting over white light-emitting-diode is the possibility to achieve ultra-high luminance. However, phosphors usually suffer laser-induced luminescence saturation, which limits the peak luminance of laser lighting devices. The aim of the present study is to develop LuAG:Ce/Al 2 O 3 composite ceramics (LACCs) with a high saturation threshold for high-luminance laser lighting. Owning to the rigid crystal structure, proper synthetic process, and optimized thermal design, the LACCs possess small thermal quenching (16% loss in luminescence at 225 ℃), high quantum yield (> 95%), and excellent luminescence properties. When the LACCs are irradiated by blue laser diodes in a reflection mode, a high luminous flux of 4634 lm and luminous efficacy of 283 lm•W −1 are realized. Furthermore, they show no sign of luminescence saturation even when the power density reaches 20.5 W•mm −2 . With these favorable properties, the designed LACCs show great potential in high-luminance laser lighting.

Laser-driven NIR light source based on MgO:Cr3+,Ni2+ phosphor-in-glass film for NIR spectroscopy application

“…1–3 White-LDs have been researched and commercialized over the past decade. 4,5 The high luminous efficiency of 300.48 lm W −1 has also been reported in the laboratory investigation. 6 However, with the evolution of lighting sources, basic white lighting is difficult to meet commercial demand for the high-technology industry.…”

Ce:(Lu,Sr)3(Al,Si)5O12 transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

“…In fact, compared with LED lighting, the problem of a cyan gap between blue and yellow emissions in LD lighting is more severe. 40,41 However, there are few studies on the green phosphor material itself. Currently, green converters and their luminescence properties are presented in Table S1 (ESI†), 6,41–54 and the luminescence properties and thermal stability of new green-light materials need to be studied and improved.…”

Cyan-green-emitting Ca 3Sc 2Si 3O 12:Ce 3+ transparent ceramics: A promising color converter for high-brightness laser lighting

“…To overcome weaknesses of organic silicone, several all-inorganic color converters, such as phosphors in glass (PiG), PiG films, single crystals, and phosphor ceramics, have been extensively investigated [9][10][11][12][13][14][15][16][17]. Among them, phosphor ceramics are recognized to be the most promising color converter for high-brightness solid-state lighting due to their excellent resistance to laser irradiation and thermal shock and easy control of microstructures [18][19][20][21][22]. To date, most laser lighting devices are still involving opaque phosphor ceramics and thus operating in a reflective mode [23,24].…”