Mechanoluminescent Properties of Mixed-anion Compounds: Ba2Gd（BO3）2Cl∶Ln

被引：0
|
作者：
He W. [1 ]
Pan X. [1 ]
Yang R. [1 ]
Zhuang Y. [1 ]
Xie R. [1 ,2 ]
机构：
[1] College of Materials, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, Xiamen University, Xiamen
[2] State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2023年 / 44卷 / 07期
基金：
中国国家自然科学基金;
关键词：
energy transfer; mechanoluminescence; mechanoluminescent mechanism; mixed-anion compound; rare earth doped luminescent materials;
D O I：
10.37188/CJL.20230123
中图分类号：
学科分类号：
摘要：
Mechanoluminescent （ML） materials show unique energy conversion features from mechanical stimulation to photon emission， making them widely used in mechanical sensing fields such as structural health diagnosis， information anti-counterfeiting， bioengineering， and electronic skins. However， the species of reported ML materials are rare and the understanding on the ML-related charge carrier transportation is insufficient， which significantly limits its development and application. In this work， novel mixed-anion typed ML materials namely Ba2Gd（BO3）2Cl∶Ln （Ln=Eu， Tb， Dy， Sm， Nd） were developed， and the charge carrier transportation processes involved in photoluminescence （PL） and ML were examined. The crystal structure， morphology， PL/ML properties and mechanism of the samples were studied by X-ray diffraction， scanning electronic microscopy， and steady-state and transient spectral techniques under multi-mode excitation. The experimental results indicated that the emissions of Ba2Gd（BO3）2Cl∶Eu were peaked at 536， 594， 613， 625， 654， 695，710 nm under 280 nm excitation. The first broad emission and other sharp ones were assigned to Eu2+ and Eu3+， respectively， showing a mixed valence states of doped Eu ions. Interestingly， the Ba2Gd（BO3）2Cl∶Eu almost exhibited orange emission from Eu3+ under mechanical stimulation， which may be attributed to the preferential excitation of valence band electrons in the host under stress. This study also showed that the optimal doping Eu concentrations in Ba2Gd（BO3）2Cl for PL and ML were both at 2%， and the mechanoluminescent intensity was linearly related to the impact energy in the range of 0.23-1.55 mJ. By changing the type of doped lanthanide， we expanded the wavelengths of ML from visible to near infrared region. This work may provide a new way to understand the mechanism of ML in phosphors including mixed valence states and the materials presented in this work show promoting applications in the field of advanced stress sensing. © 2023 Chines Academy of Sciences. All rights reserved.
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页码：1324 / 1333
页数：9
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