Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF2 Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes,Advanced Optical Materials

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Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF2 Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-03-23 , DOI: 10.1002/adom.201701343
Yi Wei _{1,

2} , Hui Xiao _{1,

2} , Zhongxi Xie _{1,

2} , Shuang Liang _{1,

3} , Sisi Liang _{1,

2} , Xuechao Cai _{1,

3} , Shanshan Huang ₁ , Abdulaziz A. Al Kheraif ₄ , Ho Seong Jang ₅ , Ziyong Cheng ₁ , Jun Lin _{1,

4}

Affiliation

Lead halide perovskite quantum dots (PQDs) have been widely recognized as highly luminescent materials for efficient optoelectronic applications owing to their fascinating electronic and optical properties. In spite of the excellent performances for the fabrication of lighting devices, the poor chemical instability greatly hampers their practical applications. The inevitable ion exchange and degradation driven from light, moisture, heat, and others limits their applications such as solid‐state light‐emitting diodes (LEDs). In this paper, the stability of PQDs is improved by integrating them in CaF₂ hierarchical nanospheres (HNSs). In comparison with the pristine perovskite materials, the outstanding optical performances are well preserved. The perovskite displays a unique quantum confinement effect in the HNSs. Additionally, embedding the quantum dots in robust CaF₂ matrices protects them from being damaged by moisture or light irradiation as well as anion exchange. Furthermore, white LED devices are obtained by mixing green CaF₂‐CsPbBr₃ composites and commercial red phosphors on a blue chip. The optimized devices show a high luminous efficacy of 62.7 lm W^–1 under 20 mA current and preserve the value of 56.3 lm W^–1 after working for 8 h.

中文翻译：

CaF2矩阵中的高发光卤化钙钛矿型钙钛矿量子点，具有增强的稳定性，可作为发白光二极管的荧光粉。

卤化钙钛矿铅量子点（PQDs）具有引人入胜的电子和光学特性，已被广泛认为是高效光电应用中的高发光材料。尽管在照明设备的制造方面具有出色的性能，但不良的化学不稳定性极大地妨碍了它们的实际应用。由于光，湿气，热量和其他因素而不可避免的离子交换和降解会限制其应用，例如固态发光二极管（LED）。本文通过将PQD集成到CaF _2中来提高其稳定性分级纳米球（HNSs）。与原始钙钛矿材料相比，出色的光学性能得到了很好的保留。钙钛矿在HNS中显示出独特的量子约束效应。此外，将量子点嵌入坚固的CaF ₂矩阵中可防止量子点受到湿气或光辐射以及阴离子交换的破坏。此外，通过将绿色CaF ₂ -CsPbBr ₃复合材料和商用红色磷光体混合在蓝色芯片上，可以获得白色LED器件。经过优化的器件在20 mA电流下显示出62.7 lm W ^–1的高发光效率，并且在工作8小时后仍保持56.3 lm W ^–1的值。

更新日期：2018-03-23

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