ZrBr<sub>4</sub>-Mediated Phase Engineering in CsPbBr<sub>3</sub> for Enhanced Operational Stability of White-Light-Emitting Diodes

ZrBr<sub>4</sub>-Mediated Phase Engineering in CsPbBr<sub>3</sub> for Enhanced Operational Stability of White-Light-Emitting Diodes

The persistent operational instability of all-inorganic cesium lead halide (CsPbX<sub>3</sub>) perovskite nanocrystals (NCs) has hindered their integration into white-light-emitting diodes (WLEDs). This study introduces a transformative approach by engineering a phase transition from CsP...

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Bibliographic Details
Main Authors: Muhammad Amin Padhiar, Yongqiang Ji, Jing Wang, Noor Zamin Khan, Mengji Xiong, Shuxin Wang
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Nanomaterials
Subjects:
all-inorganic perovskite nanocrystals
phase transformation
radiative recombination
white-light-emitting diodes (WLEDs)
luminous efficiency
operational stability
Online Access:https://www.mdpi.com/2079-4991/15/9/674
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Summary:The persistent operational instability of all-inorganic cesium lead halide (CsPbX<sub>3</sub>) perovskite nanocrystals (NCs) has hindered their integration into white-light-emitting diodes (WLEDs). This study introduces a transformative approach by engineering a phase transition from CsPbBr<sub>3</sub> NCs to zirconium bromide (ZrBr<sub>4</sub>)-stabilized hexagonal nanocomposites (HNs) through a modified hot-injection synthesis. Structural analyses revealed that the ZrBr<sub>4</sub>-mediated phase transformation induced a structurally ordered lattice with minimized defects, significantly enhancing charge carrier confinement and radiative recombination efficiency. The resulting HNs achieved an exceptional photoluminescence quantum yield (PLQY) of 92%, prolonged emission lifetimes, and suppressed nonradiative decay, attributed to effective surface passivation. The WLEDs with HNs enabled a breakthrough luminous efficiency of 158 lm/W and a record color rendering index (CRI) of 98, outperforming conventional CsPbX<sub>3</sub>-based devices. The WLEDs exhibited robust thermal stability, retaining over 80% of initial emission intensity at 100 °C, and demonstrated exceptional operational stability with negligible PL degradation during 50 h of continuous operation at 100 mA. Commission Internationale de l’Éclairage (CIE) coordinates of (0.35, 0.32) validated pure white-light emission with high chromatic fidelity. This work establishes ZrBr<sub>4</sub>-mediated HNs as a paradigm-shifting material platform, addressing critical stability and efficiency challenges in perovskite optoelectronics and paving the way for next-generation, high-performance lighting solutions.
ISSN:2079-4991

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