Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 909, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164650
Keywords
CsPbBr 3; Quantum dots; Lanthanides; Tunable emission; Solid-state lighting; WLED
Categories
Funding
- Yildiz Technical University Scientific Research Projects Coordination Unit [FDK-2021-4155]
- Turkish Academy of Sciences (TUEBA) under Outstanding Young Scientists Awards (GEBIP) program
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In this study, ultra-stable Eu3+/Dy3+ co-doped CsPbBr(3)PQD glass nano-composites are synthesized, which can achieve tunable color emissions from green to red and then to white, suitable for white light-emitting diodes. The material shows reversible photoluminescent performance and stability in water.
Colloidal CsPbBr3 perovskite quantum dots (PQDs) have substantially improved modern optoelectronic applications, including solid-state lighting, thanks to their highly pure and intense green light emission. However, some drawbacks including lead toxicity, poor stability, and difficulties in emission color tuning hinder their practical applications. Herein, ultra-stable Eu3+/Dy3+ co-doped CsPbBr(3 )PQD glass nano-composites (GNCs) with tunable color emissions from green to red and then white are synthesized via melt-quenching followed by heat-treatment method to be used in white light-emitting diodes (WLEDs). Eu3+ and Dy3+ ions are selected to overcome the color tunability obstacle of PQDs and to obtain phosphor-free white light emission with enhanced CRI values. The photoluminescent performance of GNCs is shown to be reversible at elevated temperatures and remains stable even in water. Ultimately, a prototype WLED is constructed by coupling a selected Eu3+/Dy3+ co-doped CsPbBr3 PQD GNC on top of a 400 nm-emitting LED chip to demonstrate its superior optical performance with a color rendering index of 78 and correlated color temperature of 5436 K. The developed GNCs with long-term stability, and excellent tunable luminescent properties may overcome the commercialization barriers of CsPbBr3 PQDs for WLED applications. (C) 2022 Elsevier B.V. All rights reserved.
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