Red-emitting enhancement by inducing lower crystal field symmetry of Eu3+ site in CaWO4:Eu3+ phosphor for n-UV w-LEDs
Red-emitting enhancement by inducing lower crystal field symmetry of Eu3+ site in CaWO4:Eu3+ phosphor for n-UV w-LEDs
复制标题
通过诱导 CaWO4:Eu3 荧光粉中 Eu3 位点的晶体场对称性降低来增强 n-UV w-LED 的红光发射
DOI：
10.1016/j.jallcom.2017.12.242
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发表时间：
2018-03-30
影响因子：
6.2
通讯作者：
Liu, Weisheng
中科院分区：
文献类型：
--
作者：
Xia, Minfang;Ju, Zhenghua;Liu, Weisheng
采用高温固相反应法制备了一系列增强型红发荧光粉Ca1-x-yMgxSryWO4:zEu(3+) （x = 0.00-0.30, y = 0.00-0.12, z = 0.00-0.16）。对其相结构、光致发光性能和热稳定性进行了详细的研究。所有制备的样品，特别是ca0.65 mg0.20 sr0.05 wo4 . 0.10 eu（3+）荧光粉在392 nm n-UV激发下，由于Eu3+的D-5(0)-F-7(2)跃迁，在616 nm处表现出极大增强的红色发射峰。在CaWO4: 0.10Eu（3+）中引入Mg2+和Sr2+，诱导了CaWO4基体中Eu3+离子的晶体学参数和晶体对称性的变化。红光发射增强、激发光谱宽（200 ~ 600 nm）、强紫外吸收与n-UV led芯片（350 ~ 420 nm）匹配良好、色纯度高（R/O值高达7.52），表明制备的ca0.65 mg0.20 sr0.05 wo4 . 0.10 eu（3+）样品可作为n-UV白光发光二极管的潜在候选红色荧光粉。(c) 2017 Elsevier B.V.版权所有
A series of enhanced red-emitting phosphors Ca1-x-yMgxSryWO4:zEu(3+) (x = 0.00-0.30, y = 0.00-0.12, z = 0.00-0.16) were successfully synthesized via a high temperature solid-state reaction method. The phase structure, photoluminescence properties and thermal stability were investigated detailedly. All as-prepared samples, especially Ca0.65Mg0.20Sr0.05WO4:0.10Eu(3+) phosphors exhibit an extremely enhanced red emission peaking at 616 nm originating from D-5(0)-F-7(2) transition of Eu3+ under the 392 nm n-UV excitation. Mg2+ and Sr2+ were introduced into CaWO4: 0.10Eu(3+) to induce crystallographic parameters and crystal symmetry changes of Eu3+ ions in CaWO4 host. Enhanced red emission, broadband excitation spectra (from 200 to 600 nm), strong ultraviolet absorption matched well with n-UV LEDs chips (350 -420 nm) and high color purity (the R/O value is up to 7.52) indicate that as-prepared Ca0.65Mg0.20Sr0.05WO4:0.10Eu(3+) sample can be a potential candidate red phosphor for n-UV white light-emitting diodes. (c) 2017 Elsevier B.V. All rights reserved.