posted on 2023-02-24, 14:33authored byChenjie Zhang, Lin Huang, Jinyi Wang, Tianliang Zhou, Rong-Jun Xie
Near-infrared phosphor-converted light-emitting diodes
(NIR pc-LEDs)
are ideal miniaturized NIR light sources, but it is still difficult
to find broadband-emitting NIR phosphors due to the lack of appropriate
material design principles. In this work, we propose a method to find
hosts yielding broadband NIR Cr3+ emission by screening
Ce3+-doped phosphor hosts for which both Ce3+ and Cr3+ can occupy the same crystallographic site. A
NIR phosphor Ba3Sc4O9:Cr3+ (BSO:Cr3+) with an emission peak at 835 nm and a full
width at half-maximum (FWHM) of 188 nm is obtained, where Ce3+ or Cr3+ is accommodated at the same Sc3+ site.
The BSO:Cr3+ ceramic is demonstrated to produce a NIR emitter
with an output power of 14.56 mW when driven by a blue laser diode
at 5.0 V/100 mA. By following the proposed method, two broadband NIR
phosphors composed of Li3Sc2(PO4)3:Cr3+ (λem = 1000 nm, FWHM = 223
nm) and Na3Sc2(PO4)3:Cr3+ (λem = 895 nm, FWHM = 184 nm) are further
discovered.