Inorganic halide perovskite quantum dot modified YAG-based white LEDs with superior performance

Abstract

In this work, inorganic perovskite CsPbBr_3−xI_x (x = 0–3) quantum dots (QDs) were synthesized, and their luminescence properties were studied. The optimized CsPbBrI₂ QDs were chosen as red-emitting components to modify Ce³⁺:YAG-based white LEDs (WLEDs), which exhibit promising performance with a luminous efficacy (LE) of 58 lm W⁻¹, a correlated color temperature (CCT) of 5907 K, and a color rendering index (CRI) of 90, at an operation current of 20 mA. More importantly, optical performance of the CsPbBrI₂ QD-modified WLEDs do not exhibit serious degeneration when the operational current increases to as high as 350 mA, being obviously superior to most of the chalcogenide QD-assisted phosphor-converted WLEDs reported previously. These results indicate that the CsPbBr_3−xI_x QDs are promising red phosphors for high-power WLEDs.