Structural and optical properties of Dy3+ doped Aluminofluoroborophosphate glasses for white light applications
Structural and optical properties of Dy3+ doped Aluminofluoroborophosphate glasses for white light applications
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DOI：
10.1016/j.optmat.2014.08.015
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发表时间：
2014-11
影响因子：
3.9
通讯作者：
M. Vijayakumar;K. Mahesvaran;D. Patel;S. Arunkumar;K. Marimuthu
中科院分区：
文献类型：
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作者：
M. Vijayakumar;K. Mahesvaran;D. Patel;S. Arunkumar;K. Marimuthu
采用熔融淬冷法制备了Dy 3+掺杂的铝氟硼磷酸盐玻璃（BPAxD），并通过XRD、FTIR、光吸收、激发、发射和衰减等测试研究了其结构和光学性质。通过振动能分析证实了富硼畴中BO 3基团和富磷畴中BO 4基团的共存。负的成键参数（δ）值表明，所制备的玻璃中的金属-配体环境是离子型的。用Judd-Ofelt理论计算了振子强度和发光强度Ω λ（λ= 2，4，6）参数。利用JO强度参数计算了玻璃的跃迁几率（A）、受激发射截面（σ pE）和分支比（β）等辐射性质，并与文献报道的Dy 3+掺杂玻璃进行了比较。从发光光谱中计算了浓度对Y/B强度比和产生白色光的CIE色坐标的影响。计算了色纯度和相关色温，并对结果进行了讨论。发现4F 9/2激发态在低浓度下呈单指数衰减，而在高浓度下呈非指数衰减。由于Dy 3+离子之间通过各种非辐射弛豫通道进行了有效的能量转移，产生了非指数行为，用IH模型分析了4F 9/2激发态的衰减。在制备的玻璃中，BPA 0. 5D玻璃对于6 H 13/2发射带表现出较高的σ p E、β R、σ p E × σ p E、σ p E× Δ λ eff和η值，这进而规定了其对于白色LED、激光应用和光学放大器的适用性。
Abstract Dy 3+ doped Aluminofluoroborophosphate glasses (BPAxD) have been prepared following conventional melt quenching technique and their structural and optical properties were explored through XRD, FTIR, optical absorption, excitation, emission and decay measurements. The coexistence of BO 3 groups in borate rich domain and BO 4 groups in phosphate rich domain have been confirmed through vibrational energy analysis. Negative bonding parameter (δ) values indicate that, the metal–ligand environment in the prepared glasses is of ionic in nature. The oscillator strength and the luminescent intensity Ω λ (λ= 2, 4 and 6) parameters are calculated using Judd–Ofelt theory. The radiative properties such as transition probability (A), stimulated emission cross-section (σ p E) and branching ratios (β) have been calculated using JO intensity parameters and compared with the reported Dy 3+ doped glasses. Concentration effect on Y/B intensity ratios and the CIE chromaticity coordinates were calculated for the generation of white light from the luminescence spectra. The color purity and the correlated color temperature were also calculated and the results are discussed in the present work. The decay of the 4 F 9/2 excited level is found to be single exponential for lower concentration and become non-exponential for higher concentration. The non-exponential behavior arises due to the efficient energy transfer between the Dy 3+ ions through various non-radiative relaxation channels and the decay of the 4 F 9/2 excited level have been analyzed with IH model. Among the prepared glasses, BPA0. 5D glass exhibits higher σ p E, β R, σ p E× σ p E, σ p E× Δ λ eff and η values for the 6 H 13/2 emission band which in turn specifies its suitability for white LEDs, laser applications and optical amplifiers.