Warm white light-emitting diodes using organic–inorganic halide perovskite materials coated YAG:Ce3+ phosphors.

This work reports warm white light-emitting diodes (WLEDs) using organic–inorganic halide perovskite materials coated YAG:Ce 3+ phosphors by a liquid phase synthesis method. The perovskite MAPbBr 3−x I x -coated YAG:Ce 3+ phosphors have more red light contribution than YAG:Ce 3+ phosphors without the perovskite coating. The chromaticity coordinate of white LED with YAG:Ce 3+ remote phosphor is (x = 0.3134, y = 0.3497) 6359. However, those of MAPbBr 2.5 I 0.5 and MAPbBr 2.0 I 1.0 -coated YAG:Ce 3+ remote phosphor shift to (x = 0.4220, y = 0.3725) 2908 and (x = 0.4067, y = 0.4028) 3525, respectively. The colors of perovskite-coated samples are more red and warm. Therefore, the perovskite-coated YAG:Ce 3+ method is useful for warm WLED. [ABSTRACT FROM AUTHOR]