Blue-emitting long-persistent luminescence phosphor Pb2+-doped CsCdCl3

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-10-23 DOI:10.1016/j.jlumin.2024.120957

Bingyan Qu , Changrui Zhu , Gaoliang Huang , Yang Jiang , Rulong Zhou , Lei Wang

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引用次数: 0

Abstract

In our traditional impressions, the emission spectra of Pb²⁺ ions usually fall predominantly within the UV region. In this work, we find when coordinated with haloid Cl⁻ ions in CsCdCl₃, the Pb²⁺ ions could demonstrate bright blue emission from 350 to 500 nm with maximum peaking at about 412 nm under the excitation of 250–320 nm light. This emission can be assigned to ³P₁ → ¹S₀ transition of Pb²⁺ ions. More interestingly, this all-inorganic metal halide compound CsCdCl₃:Pb²⁺ exhibits a long persistent luminescence (LPL) lasting 1050 s, endowed with application potential in the information storage and function of analysis and detection. The LPL mechanism of Pb²⁺ in CsCdCl₃ has been studied by thermoluminescence (TL) measurements and the First-principle calculation, which dominate that the 6p levels of Pb²⁺ are just below the conduction band by about 0.6 eV. The excited electrons can travel across these 6p levels and the electron traps through the conduction band thermally, delaying the emission temporarily and producing the afterglow finally. Our finding in this work proves the potential of Pb²⁺ activated phosphors in visible region and provides a unique approach to construct Pb²⁺ doped LPL phosphors.

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掺杂 Pb2+ 的 CsCdCl3 蓝色长持续发光荧光粉

在我们的传统印象中，Pb2+ 离子的发射光谱通常主要位于紫外区。在这项研究中，我们发现当 Pb2+ 离子与 CsCdCl3 中的卤代 Cl- 离子配位时，在 250-320 纳米光的激发下，可在 350-500 纳米范围内发出明亮的蓝色发射光，最大峰值约为 412 纳米。这种发射可归因于 Pb2+ 离子的 3P1 → 1S0 转变。更有趣的是，这种全无机金属卤化物化合物 CsCdCl3:Pb2+ 显示出持续 1050 秒的长持续发光（LPL），在信息存储和分析检测功能方面具有应用潜力。通过热致发光（TL）测量和第一原理计算研究了 Pb2+ 在 CsCdCl3 中的 LPL 机制。受激电子可以穿过这些 6p 电平，电子陷阱通过导带的热效应，暂时延迟发射，最终产生余辉。我们在这项工作中的发现证明了 Pb2+ 活化荧光粉在可见光区域的潜力，并为构建掺杂 Pb2+ 的 LPL 荧光粉提供了一种独特的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.