The Investigations of the Pr, Gd, Si–N Doping, and Phosphor Curvature Effects on the Performances of YAG‐Based WLEDs

Abstract

The effect of the phosphor curvature in the range 0. (YAlSiON) for YAG were assessed under the same phosphor curvature of 0.2589 mm -1 and the similar CCT~6350 K. Taking the luminous efficacy, preparation cost of phosphors, and CRI into consideration, we suggest that the YGdAG is a preferable candidate for replacing the YAG for use in WLEDs among the four kinds of phosphors. Compared with the YAG (7.5 wt%)-based WLED, the YGdAG (7 wt%)-based WLED exhibited an improved CRI, less preparation cost of phosphors, and the acceptable reduction in luminous efficacy under 350 mA.

Cooperative cation substitution facilitated construction of garnet oxynitride MgY2Al3Si2O11N:Ce3+ for white LEDs

“…The d-spacing values are 0.268 and 0.320 nm, which correspond to the (420) and (23 1) inter-planar spacing of the cubic Y 3 Al 5 O 12 , respectively. 25 Furthermore, the presence of sharp diffraction spots in the obtained SAED patterns ( Figure 4B 26 These diffraction spots correspond to the interplaner spacing of (420), (23 1) and (2 11), respectively, 27 which is in agreement with the XRD results. Figure 4C shows the energy dispersive X-ray mapping of MSNG.…”

“…The clear 2 dimensional lattice fringes (Figure A) demonstrate that the prepared phosphor is in the high crystallinity. The d‐spacing values are 0.268 and 0.320 nm, which correspond to the (420) and () inter‐planar spacing of the cubic Y 3 Al 5 O 12 , respectively . Furthermore, the presence of sharp diffraction spots in the obtained SAED patterns (Figure B) reveals the formation of well crystalline garnet phosphor MgY 2 Al 3 Si 2 O 11 N .…”