Preparation and luminescence of Dy3+/Tm3+ co-doped Ca3NbGa3Si2O14 glass-ceramics for w-LED
Preparation and luminescence of Dy3+/Tm3+ co-doped Ca3NbGa3Si2O14 glass-ceramics for w-LED
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白光LED用Dy3/Tm3共掺杂Ca3NbGa3Si2O14微晶玻璃的制备及发光
DOI：
10.1016/j.ceramint.2022.11.052
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发表时间：
2022-11
影响因子：
5.2
通讯作者：
Jianhui Huang
中科院分区：
文献类型：
--
作者：
Yucong Zhao;Haodong Yue;Guoliang Gong;Fengqin Lai;Weixiong You;Liaolin Zhang;Jianhui Huang
本文采用传统的熔融晶化法制备了一系列Dy3+和Dy3+/Tm3+离子激活的Ca3NbGa3Si2O14微晶玻璃，并研究了该微晶玻璃的结构、光学和基于能量转移(ET)的光致发光(PL)性质。采用差热分析、X射线衍射仪、扫描电子显微镜、紫外-可见光谱仪等技术对微晶玻璃的制备、物相组成、透光率、最佳热处理条件和发光性能进行了研究。获得透明、结构良好的微晶玻璃的最佳热处理工艺是在820℃晶化5h，Tm3+和Dy3+激发的光谱在352 nm和365 nm处有交点，这意味着CNGs：Dy3+/Tm3+可以被352 nm和365 nm的紫外光有效激发。在35 2 nm紫外光激发下，1D2→3F4、4F9/2→6H15/2、4F9/2→6H13/2、4F9/2→6H11/2的4个主发光峰分别位于45 6 nm、4 84 nm、5 77 nm和6 6 3 nm。当Dy3+的最佳掺杂浓度(4at.%)与不同的Tm3+共掺时，可以通过调节Tm3+的掺杂量和改变激发波长来调节发光颜色。在Tm3+掺杂玻璃的发射光谱和Dy3+掺杂玻璃的激发光谱之间存在重叠区域，表明Tm3+和Dy3+之间存在能量转移。此外，CNGS：Dy3+/TM3+CIE坐标显示，在352 nm激发下，y=0.02时的色坐标(0.3324，0.3352)最接近标准白光(0.333，0.333)，这表明该玻璃在发光二极管器件中具有潜在的应用前景。
In this work, a series of Dy 3+ and Dy 3+ /Tm 3+ ion activated Ca 3 NbGa 3 Si 2 O 14 glass-ceramics were prepared by traditional melt crystallization method, and report on the structural, optical, and energy transfer (ET)-based photoluminescence (PL) properties of glass-ceramics co-doped Dy 3+ /Tm 3+ . The preparation of glass-ceramics was studied by DTA, XRD, SEM, and UV–vis photometer technology, phase composition, transmittance, optimum heat treatment conditions, and luminescence properties. The best heat treatment procedure for obtaining transparent and well-formed glass-ceramics is crystallization at 820 °C for 5 h. The spectra excited by Tm 3+ and Dy 3+ have intersections at 352 nm and 365 nm, which means that CNGS: Dy 3+ /Tm 3+ can be effectively excited by 352 nm and 365 nm ultraviolet light. Under the excitation of 352 nm ultraviolet light, four main emission peaks corresponding to 1 D 2 → 3 F 4 , 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 , 4 F 9/2 → 6 H 11/2 were found at 456 nm, 484 nm, 577 nm, and 663 nm, respectively. When the optimal concentration (4 at.%) of Dy 3+ is Co-doped with a different amount of Tm 3+ , the luminous color can be adjusted by adjusting the doping amount of Tm 3+ and changing the excitation wavelength. There is an overlapping region between the emission spectrum of Tm 3+ doped glass and the excitation spectrum of Dy 3+ doped glass, which indicates that there is energy transfer between Tm 3+ and Dy 3+ . In addition, CNGS: Dy 3+ /Tm 3+ CIE coordinates show that the color coordinates (0.3324, 0.3352) when y = 0.02 under 352 nm excitation are closest to the standard white light (0.333, 0.333), indicating that this glass has potential applications in WLED devices.
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