Nanocrystalline structure control and tunable luminescence mechanism of Eu-doped CsPbBr3 quantum dot glass for WLEDs,Nanoscale

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Nanocrystalline structure control and tunable luminescence mechanism of Eu-doped CsPbBr3 quantum dot glass for WLEDs
Nanoscale ( IF 5.8 ) Pub Date : 2020/03/10 , DOI: 10.1039/d0nr01207f
Panpan Li _{1,

2,

3} , Yongmin Duan _{1,

2,

3} , Yang Lu _{1,

2,

3} , An Xiao _{1,

2,

3} , Ziyang Zeng _{1,

2,

3} , Shiqing Xu _{1,

2,

3} , Junjie Zhang _{1,

2,

3}

Affiliation

CsPbX₃(Cl, Br, I) perovskite quantum dot glass has been widely reported, and the discovery of next-generation perovskite luminescent materials has been challenged by doping rare earth activators with energy-level transitions. In this work, we report a novel Eu-doped quantum dot glass material with tunable luminescence properties. The structure characteristics and tunable luminescence mechanism were investigated by combining X-ray diffraction, X-ray photoelectric spectroscopy, excitation and emission spectra. It was found that Eu ions replaced the lattice of Pb in CsPbBr₃ quantum dots and formed CsEuBr₃ quantum dots, which resulted in a blue emission. Meanwhile, a green emission from CsPbBr₃ quantum dots and a red emission originally from Eu³⁺ in the glass matrix can also be observed by controlling the heat treatment temperature. A light-emitting diode is designed based on the prepared Eu-doped quantum dot glass without doping any phosphors, and a warm light with CCT at 4075 K is obtained. The present work provides a new luminescence tunable design principle for europium-doped quantum dot glass materials and could inspire the future exploration of rare earth ion-doped quantum dot glass materials.

中文翻译：

用于WLED的Eu掺杂CsPbBr3量子点玻璃的纳米晶结构控制和可调发光机理

CsPbX ₃（Cl，Br，I）钙钛矿量子点玻璃已被广泛报道，而下一代钙钛矿发光材料的发现已受到能量级跃迁掺杂稀土活化剂的挑战。在这项工作中，我们报告了一种具有可调发光特性的新型Eu掺杂量子点玻璃材料。通过结合X射线衍射，X射线光电光谱，激发和发射光谱研究了结构特征和可调发光机理。发现Eu离子取代了CsPbBr ₃量子点中的Pb的晶格并形成了CsEuBr ₃量子点，从而导致蓝色发射。同时，CsPbBr ₃的绿色发射通过控制热处理温度，还可以观察到量子点和最初来自玻璃基质中Eu ³⁺的红色发射。基于制备的不掺杂任何荧光粉的掺Eu量子点玻璃，设计了一种发光二极管，并获得了4075 K下CCT的暖光。本工作为掺euro量子点玻璃材料提供了一种新的发光可调设计原理，可以激发稀土离子掺杂量子点玻璃材料的未来探索。

更新日期：2020-03-27

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