Abstract
Abstract Halide perovskites as novel optoelectronic materials have been considered to be good candidates as efficient luminescence converters for light-emitting diodes. In this work, the alloying CsPbBr 1.2 I 1.8 quantum dots (QDs) and perovskite CsPbI 3 QDs were synthesized, and their phase structure, morphology and luminescence toward humidity were investigated. Compared with CsPbI 3 QDs, the alloying CsPbBr 1.2 I 1.8 QDs displayed more stable cubic phase and better resistance to moisture. In addition, the enhanced phase-stability has been explained. Furtherly, the CsPbBr 1.2 I 1.8 QDs were used as red-emitting phosphors to improve the performance of white light-emitting diodes (WLED), and the as-fabricated WLED showed high luminous efficiency and excellent color rendering index (Ra), which indicated that the CsPbBr 1.2 I 1.8 QDs were promising red-emitting materials. Significantly, the values of Ra and correlated color temperature (CCT) were basically stable with the variation of operation current, implying the excellent color stability of CsPbBr 1.2 I 1.8 QDs-modified WLED.
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