Excitation-dependent ultraviolet-visible persistent luminescence and charge trapping in Ca2Al2SiO7: Ce3+

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-02-14 DOI:10.1016/j.optmat.2026.117969

Dace Nilova, Didzis Salnajs, Guna Doke, Andris Antuzevics

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引用次数: 0

Abstract

Ultraviolet (UV) persistent luminescence (PersL) materials are notable for their diverse applications, including sterilization, biomedical uses, and anti-counterfeiting markers. In this work, we report an in-depth investigation of luminescence, defect formation, and UV-visible PersL properties of Ce³⁺-activated Ca₂Al₂SiO₇. Structural characterisation confirms successful incorporation of Ce³⁺ into the material. PersL excitation and electron paramagnetic resonance (EPR) spectra measurements suggest photoionisation of Ce³⁺ to Ce⁴⁺. Thermally stimulated luminescence (TSL) spectroscopy analyses reveal that the activation energies of UV-induced charge traps are in the 0.85-1.2 eV range. The PersL of Ca₂Al₂SiO₇: Ce³⁺ can be detected for longer than 48 h above the 5⋅10⁻⁴ mW/m²/sr radiance threshold. Moreover, its emission reaches a power density of 12.55 mW/m² at 10 s after UV excitation, demonstrating both a high initial signal intensity and slow decay. These results reveal crucial information about achieving optimal performance of Ca₂Al₂SiO₇: Ce³⁺ as an efficient UV-visible persistent phosphor.

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Ca2Al2SiO7: Ce3+的激发依赖性紫外可见持续发光和电荷俘获

紫外线（UV）持续发光（PersL）材料以其多种应用而闻名，包括灭菌，生物医学用途和防伪标记。在这项工作中，我们报道了Ce3+活化Ca2Al2SiO7的发光，缺陷形成和紫外可见PersL性质的深入研究。结构表征证实Ce3+成功掺入到材料中。PersL激发和电子顺磁共振（EPR）光谱测量表明Ce3+光解离到Ce4+。热激发发光（TSL）光谱分析表明，紫外光诱导电荷阱的活化能在0.85 ~ 1.2 eV范围内。在5⋅10−4 mW/m2/sr辐射阈值以上，Ca2Al2SiO7: Ce3+的PersL可以被检测到超过48 h。在紫外激发后10 s，其发射功率密度达到12.55 mW/m2，显示出高的初始信号强度和缓慢的衰减。这些结果揭示了Ca2Al2SiO7: Ce3+作为高效紫外可见持久性荧光粉实现最佳性能的关键信息。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.