Ce3+ and Cr3+ co-activated ultra-wide visible-NIR garnet phosphor for phosphor-converted light emitting diode

Abstract

In the past decade, the near-infrared (NIR) phosphor-converted light emitting diode (pc-LED) and NIR phosphors has made considerable progress. However, for the field of non-destructive testing, ultra-wide Vis-NIR pc-LED light source can detect a wider range of components compared to NIR pc-LED. Therefore, the development of high-performance ultra-wide Vis-NIR phosphors is quite necessary. Based on the CaLu2Mg2Si3O12 (CLMSO):Cr3+ with excellent performance, this article proposes the introduction of activator Ce3+ into CLMSO:Cr3+ phosphor, which significantly increase the emission band-width. Co-doped phosphor exhibit excellent thermal stability (maintain 75 % room temperature intensity @ 150 °C). The Vis-NIR light output power can reached 64.4 mW @ 100 mA and 60.9 mW@ 100 mA for pc-LED fabricated with CLMSO:0.01Ce3+, 0.001Cr3+ and CLMSO:0.01Ce3+, 0.002Cr3+ with the electricity to Vis-NIR conversion efficiency reached 30.5 %@10 mA and 29.5 % @10 mA, respectively. The CLMSO: Ce3+, Cr3+ phosphor is expected to become the new generation light sources for miniaturized spectrometer.