Tunable Broadband Visible Emission Achieved by Phase Transformation-Driven Self-Reduction of Eu3+ to Eu2+ in Calcium Phosphate Matrix

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-04-21 DOI:10.1039/d5dt00681c

Sapargali Pazylbek, Jonas Stadulis, Guna Doke, Andris Antuzevics, Vladimir Pankratov, Greta Merkininkaite, Arturas Katelnikovas, Aleksej Zarkov

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引用次数: 0

Abstract

In this work, we report the synthesis of Eu2+-doped alpha-tricalcium phosphate (α-TCP, α-Ca3(PO4)2) via a phase transformation of Eu3+-doped CaHPO4 ∙ 2H2O. The phase conversion accompanied by a reduction of Eu3+ to Eu2+ occurred during the annealing of the starting material in a vacuum. The optical properties of the obtained α-TCP:Eu2+ were investigated by photoluminescence (PL), thermally stimulated luminescence, and persistent luminescence decay measurements. The obtained material exhibited tunable broadband PL with FWHM values ranging from 94 to 142 nm at room temperature. The PL can be tuned in terms of emission maximum and FWHM by varying the excitation wavelength. The broadband emission was achieved due to the multi-site occurrence of Eu2+ ions in the complex α-TCP matrix. Three types of traps were determined with activation energy values of 0.80, 0.75, and 0.68 eV. After irradiation with X-rays, an afterglow characterizable by a Eu2+ broadband spectrum with a maximum at around 480 nm can be detected for at least 10 h.

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在磷酸钙基质中，相变驱动Eu3+自还原为Eu2+实现可调谐宽带可见发射

在这项工作中，我们报道了通过Eu3+掺杂CaHPO4∙2H2O的相变合成了Eu2+掺杂的α-磷酸三钙（α-TCP, α-Ca3(PO4)2）。在真空退火过程中，发生了Eu3+向Eu2+还原的相变。通过光致发光（PL）、热激发发光和持续发光衰减测量研究了α-TCP:Eu2+的光学性质。所获得的材料在室温下显示出可调谐的宽带PL， FWHM值在94 ~ 142 nm之间。通过改变激发波长，可以根据发射最大值和FWHM来调谐PL。由于Eu2+离子在配合物α-TCP基体中多位点存在，实现了宽带发射。三种捕集器的活化能分别为0.80、0.75和0.68 eV。在x射线照射后，可以检测到至少10小时的余辉，其特征是Eu2+宽带光谱，最大波长约为480 nm。

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

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.