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Cerium Ion Promoting the Emission of Self-Trapped Excitons of Quasi-2D Europium Halide Perovskites for Self-Activated White Light-Emitting
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-04-24 , DOI: 10.1021/acs.jpcc.3c01271 Xinyu Fu 1, 2 , Yao Li 1, 2 , Huwei Li 1, 3 , Jing Feng 1, 2 , Hongjie Zhang 1, 2, 4
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2023-04-24 , DOI: 10.1021/acs.jpcc.3c01271 Xinyu Fu 1, 2 , Yao Li 1, 2 , Huwei Li 1, 3 , Jing Feng 1, 2 , Hongjie Zhang 1, 2, 4
Affiliation
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Lead-free halide perovskites (LFHPs) have been intensively studied due to their characteristics of nontoxicity, unique structure, and tunable photoluminescence properties by replacing lead ions. Here, we report a special quasi-two-dimensional (quasi-2D) RbEu2Cl5 through a self-reducing hot-injection method. The as-prepared RbEu2Cl5 shows two sharp blue emissions (430 and 470 nm) and a shoulder broad emission (510 nm), which could be attributed to the 4f65d1 → 4f7 electronic dipole transition of Eu2+ in different coordination structures (CN = 8 and 7) and self-trapped excitons (STEs), respectively. Then, Ce3+ ions are introduced into RbEu2Cl5 to enhance the STEs luminescence by crystal lattice distortion and heighten photoluminescence quantum yields. At the optimal doping concentration of 10%, RbEu2Cl5:Ce3+ NCs could exhibit excellent self-activated warm white emission. Furthermore, the corresponding white light-emitting diodes device with the CIE color coordinate (0.36, 0.38) was fabricated by combining RbEu2Cl5:10% Ce3+ NCs with an ultraviolet light-emitting diodes chip. This work not only develops a new LFHPs structure, but also provides potential LFHPs for self-activated white light-emitting applications.
中文翻译：
铈离子促进准二维铕卤化物钙钛矿自陷激子的发射用于自激活白光发射
无铅卤化物钙钛矿 (LFHPs) 因其无毒、独特的结构和通过替代铅离子可调节的光致发光特性等特点而受到深入研究。在这里，我们通过自还原热注入方法报告了一种特殊的准二维 (quasi-2D) RbEu 2 Cl 5 。所制备的 RbEu 2 Cl 5显示出两个尖锐的蓝色发射（ 430和470 nm）和一个肩宽发射（ 510 nm），这可归因于Eu 2+在分别具有不同的配位结构（CN = 8 和 7）和自陷激子（STE）。那么，Ce 3+将离子引入 RbEu 2 Cl 5以通过晶格畸变增强 STE 发光并提高光致发光量子产率。在10%的最佳掺杂浓度下，RbEu 2 Cl 5 :Ce 3+ NCs可以表现出优异的自激活暖白光发射。此外，将RbEu 2 Cl 5 :10% Ce 3+ NCs与紫外发光二极管芯片结合，制备了相应的CIE色坐标为（0.36，0.38）的白光发光二极管器件。这项工作不仅开发了一种新的 LFHPs 结构，而且还为自激活白光应用提供了潜在的 LFHPs。
更新日期：2023-04-24
中文翻译：
铈离子促进准二维铕卤化物钙钛矿自陷激子的发射用于自激活白光发射
无铅卤化物钙钛矿 (LFHPs) 因其无毒、独特的结构和通过替代铅离子可调节的光致发光特性等特点而受到深入研究。在这里，我们通过自还原热注入方法报告了一种特殊的准二维 (quasi-2D) RbEu 2 Cl 5 。所制备的 RbEu 2 Cl 5显示出两个尖锐的蓝色发射（ 430和470 nm）和一个肩宽发射（ 510 nm），这可归因于Eu 2+在分别具有不同的配位结构（CN = 8 和 7）和自陷激子（STE）。那么，Ce 3+将离子引入 RbEu 2 Cl 5以通过晶格畸变增强 STE 发光并提高光致发光量子产率。在10%的最佳掺杂浓度下，RbEu 2 Cl 5 :Ce 3+ NCs可以表现出优异的自激活暖白光发射。此外，将RbEu 2 Cl 5 :10% Ce 3+ NCs与紫外发光二极管芯片结合，制备了相应的CIE色坐标为（0.36，0.38）的白光发光二极管器件。这项工作不仅开发了一种新的 LFHPs 结构，而且还为自激活白光应用提供了潜在的 LFHPs。
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