Understanding the Influence of Electron Traps and Urbach States on the Kinetics of Ti3+ Persistent Luminescence in LaAlO3:Ti3+

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-02-06 DOI:10.1021/acs.inorgchem.5c00390

Wojciech M. Piotrowski, Justyna Zeler, Vasyl Kinzhybalo, Karolina Ledwa, Paulina Bukowska, Eugeniusz Zych, Lukasz Marciniak

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Abstract

The luminescence kinetics of Ti³⁺ ions, resulting from the spin-allowed ²E → ²T₂ electron transition, are generally expected to be fast, within the microsecond range. However, in this study, we observed average lifetimes of up to 30 ms in nanocrystalline LaAlO₃:Ti³⁺ powders. Our detailed analysis of the spectroscopic and thermoluminescence properties of LaAlO₃:Ti³⁺ suggests that this prolonged Ti³⁺ kinetics is associated with the presence of electron traps and the proximity of the Ti³⁺ excited state to the conduction band, which facilitates energy transfer between them. Furthermore, the observed shift in Urbach states with an increasing Ti³⁺ concentration correlates with the efficiency of energy transfer between deeper traps and Ti³⁺ ions. This study provides a comprehensive strategy for controlling the luminescence kinetics of Ti³⁺ ions through electron trap engineering, induced by dopant ion concentration, which can be applied in various fields including luminescence thermometry.

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LaAlO3:Ti3+中电子陷阱和Urbach态对Ti3+持续发光动力学的影响

Ti3+离子的发光动力学是由自旋允许的2E→2T2电子跃迁引起的，通常预计会很快，在微秒范围内。然而，在这项研究中，我们观察到纳米晶LaAlO3:Ti3+粉末的平均寿命高达30 ms。我们对LaAlO3:Ti3+的光谱和热释光特性的详细分析表明，这种延长的Ti3+动力学与电子陷阱的存在和Ti3+激发态接近导带有关，这有利于它们之间的能量转移。此外，随着Ti3+浓度的增加，Urbach态的位移与更深的陷阱和Ti3+离子之间的能量转移效率有关。本研究提供了一种通过掺杂离子浓度诱导的电子陷阱工程来控制Ti3+离子发光动力学的综合策略，可应用于包括发光测温在内的各个领域。

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

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.