Warm white-light emission harvesting with enhanced color rendering index in conventional alloyed CdS0.7Se0.3 quantum dots

Warm WLED with high color rendering index (CRI) are greatly required for the widespread use of solid-state lighting especially indoors. Here, a remarkable improvement of CRI in alloyed CdS0.7Se0.3 QDs was achieved by pressure engineering. Notably, white light with enhanced CRI of 93, higher than pristine CRI of 47, was retained upon the complete release of pressure, accompanied by a color change from ‘natural’ (4298 K) to ‘warm’ white light (2170 K). Synchrotron ADXRD shows that CdS0.7Se0.3 QDs experienced an irreversible phase transition from the zinc blende phase to rocksalt structure. Warm white light with enhanced color rendering index of 93 is achieved by pressure processing, accompanied by a color change from ‘natural’ (4298 K) to ‘warm’ white light (2170 K).