Molybdenum substitution simultaneously induced band structure modulation and luminescence enhancement in LiLaMg(W, Mo)O6: Eu3+ red-emitting phosphor for near ultraviolet excited white light diodes
Molybdenum substitution simultaneously induced band structure modulation and luminescence enhancement in LiLaMg(W, Mo)O6: Eu3+ red-emitting phosphor for near ultraviolet excited white light diodes
复制标题
钼替代同时诱导 LiLaMg(W, Mo)O-6: Eu3 红光荧光粉的能带结构调制和发光增强，用于近紫外激发白光二极管
DOI：
10.1016/j.jallcom.2018.05.306
复制
发表时间：
2018-09-30
影响因子：
6.2
通讯作者：
Zhou, Xianju
中科院分区：
文献类型：
--
作者：
Li, Li;Chang, Wenxuan;Zhou, Xianju
本研究采用高温固相反应法合成了LiLaMgW 1-xMoxO 6：Eu 3+荧光粉。通过Mo 6+取代改变W-0电荷转移（CT）带，使荧光粉的激发带大大展宽，与InGaN基LED芯片匹配良好。研究了W/Mo比对LiLaMgW_（1-x）Mo_xO_（6：0.1）Eu（3+）荧光粉晶体结构、漫反射光谱、光致发光性能的影响。随着Mo ~（6+）浓度的增加，电荷转移带（CTB）发生红移。采用密度泛函理论（DFT）计算能带结构，以支持激发带调制。此外，LiLa_（1-y）MgW_（0.7）Mo_（0.3）O_（6：y）Eu（3+）荧光粉具有较强的红光发射。对荧光粉的激发光谱、发射光谱、衰减动力学和热稳定性进行了详细的测试和研究。Eu ~（3+）的浓度猝灭最高可达20 mol%，浓度猝灭归因于偶极-偶极相互作用。最后，通过将最佳红色磷光体、商业绿色和蓝色发光磷光体的混合物与近紫外（UV）InGaN基LED芯片集成来制造白光LED器件。结果表明，Eu ~（3+）激活的LiLaMgW_（0.7）-Mo_（0.3）O_6荧光粉是一种很有前途的白光LED用红色荧光粉。(C)2018 Elsevier B. V.版权所有。
In this study, LiLaMgW1-xMoxO6: Eu3+ phosphors have been synthesized by high-temperature solid-state reaction method. By changing the W-0 charge transfer (CT) band through Mo6+ substitution, the excitation band of obtained phosphors had been widened largely and could match well with the InGaN-based LED chips. The crystal structure, diffuse reflection spectra, photoluminescent properties of the LiLaMgW1-xMoxO6: 0.1Eu(3+) phosphors were investigated as a function of W/Mo ratio. The red shift of charge transfer band (CTB) was observed with the increase of Mo6+ concentration. Density functional theory (DFT) were performed to calculate the band structure in order to support the excitation band modulation. Moreover, LiLa1-yMgW0.7Mo0.3O6:yEu(3+) phosphors exhibit strong red emission. The excitation, emission spectra, decay dynamics and thermal stability of the phosphors had been measured and investigated in detail. The quenching concentration of Eu3+ is up to 20 mol% and the concentration quenching is attributed to the dipole-dipole interaction. Finally, a white-LED device was fabricated by integrating a mixture of optimal red phosphor, commercial green- and blue-emitting phosphors with a near-ultraviolet (UV) InGaN-based LED chip. The results suggest that the Eu3+-activated LiLaMgW0.7- Mo0.3O6 phosphor is a promising red-emitting phosphor for white-LEDs. (C) 2018 Elsevier B.V. All rights reserved.