CaAlSiN3:Eu/glass composite film in reflective configuration: A thermally robust and efficient red-emitting color converter with high saturation threshold for high-power high color rendering laser lighting

Abstract To achieve high color rendering and proper temperature, a red converter is essential for phosphor-converted white lighting devices. CaAlSiN3:Eu2+ (CASN) highly suitable phosphor light-emitting diodes. However, it can be hardly used in high-power laser due to poor thermal/chemical performance of the phosphor/silicone resin mixture. A series all-inorganic CASN-based phosphors (e.g., composite ceramic phosphor-in-glass) were developed avoid use resin. new challenges emerged: none them showed sufficient luminous efficacy (i.e., >50 lm/W) adequate saturation-threshold >30 W or 10 W/mm2). Here, we report facile fabrication CASN/glass films using simple efficient blade-coating method. Upon 450 nm excitation, resultant film presents internal quantum efficiency ~83%, comparable that pristine CASN powder (~90%). When irradiated with blue laser, shows record 82 lm/W. Furthermore, its saturation threshold was investigated power density mode, respectively. measured over 29.7 W (1.75 W/mm2), thus achieving flux 1576 lm; when ~10.2 W/mm2 (1.13 W). With abovementioned excellent properties, has great potential lighting.