Warm white-light emission harvesting with enhanced color rendering index in conventional alloyed CdS_0.7Se_0.3 quantum dots

Abstract

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 CdS_0.7Se_0.3 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 CdS_0.7Se_0.3 QDs experienced an irreversible phase transition from the zinc blende phase to rocksalt structure.

GRAPHICAL ABSTRACT

IMPACT STATEMENT

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).

KEYWORDS:

• High pressure
• phase transition
• alloyed CdS_0.7Se_0.3
• warm-white light emission
• color rendering index

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by National Key R&D Program of China [grant number 2019YFE0120300], the National Science Foundation of China [grant numbers 12174144, 21725304, 22131006, 12174146 and 11774125], and the China Postdoctoral Science Foundation [grant number 2021M690065]. This work was mainly performed at BL15U1 at the Shanghai Synchrotron Radiation Facility (SSRF). Portions of this work were performed at 4W2HP-Station, Beijing Synchrotron Radiation Facility (BSRF).