Garnet type Y2Mg3Ge3O12: Dy3+ / Eu3+ phosphors excited near ultraviolet: Luminescence properties and energy transfer mechanisms

• Published in: Journal of solid state chemistry 2021-09, Vol.301, p.122295, Article 122295
• Main Authors: Wang, Zhongxue, Cheng, Liqun, Tang, He, Yu, Xiaofang, Xie, Jihuan, Mi, Xiaoyun, Liu, Quansheng, Zhang, Xiyan
• Format: Article
• Language: English
• Subjects: Energy transfer; Excellent thermal stability; Photoluminescence; Y2Mg3Ge3O12 phosphor
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2021.122295

A battery of Dy3+ single-doped and Dy3+/Eu3+ co-doped Y2Mg3Ge3O12 phosphors were manufactured by high-temperature solid-phase method. The XRD patterns were tested and Rietveld refined. When the samples were excited by 352 ​nm near ultraviolet light, the energy transfer efficiency can reach 83.2%, and the energy transfer mechanism is electric dipole-electric dipole interaction. The thermal stability of Y1.75Mg3Ge3O12:0.05Dy3+, 0.2Eu3+ was tested. When the temperature reached 150 ​°C, its luminous intensity droped to 92.4% of the initial temperature (30 ​°C). By changing the concentrations of Eu3+, white light with red light can be obtained. The above results indicate that these samples are expected to become candidate materials in the domain of solid-state lighting. In this paper, a near-ultraviolet excited garnet type Y2Mg3Ge3O12: Dy3+/Eu3+ phosphors were synthesized successfully. The energy transfer efficiency reaches 83.2%. The Y1.95-yMg3Ge3O12: 0.05Dy3+, yEu3+ samples have excellent thermal stability. When the sample was heated to 150 ​°C, the luminous intensity can still reach 92.4% of the luminous intensity at the initial temperature. [Display omitted] •Y1.95-yMg3Ge3O12:0.05Dy3+, yEu3+ were synthesized by high temperature solid phase method.•For Y1.95-yMg3Ge3O12: 0.05Dy3+, yEu3+ phosphors, the energy transfer efficiency is calculated to be 83.2%.•The emission intensity can still reach 92.4% at 423K of that at room temperature.