Eu3 -doped ZnLaB5O10: A suitable candidate for near ultraviolet LED pumped red phosphor
Eu3 -doped ZnLaB5O10: A suitable candidate for near ultraviolet LED pumped red phosphor
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Eu3 掺杂 ZnLaB5O10：近紫外 LED 泵浦红色荧光粉的合适候选者
DOI：
10.1016/j.jssc.2019.05.004
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发表时间：
2019
影响因子：
3.3
通讯作者：
Yang Tao
中科院分区：
文献类型：
--
作者：
Yang Ruirui;Jiang Pengfei;Gao Wenliang;Cong Rihong;Yang Tao
因此，开发一种能被近紫外光（NUV）有效激发，并与商用LED芯片波长相匹配的红色荧光粉具有重要意义。ZnLaB_5 O_（10）具有明显的La ~（3+）畸变配位，适合于Eu ~（3+）的掺入，其宇称禁戒律在这种配位中被抑制，并能被近紫外区的f-f跃迁有效激发。采用高温固相反应法制备了ZnLa_（1-x）Eu_xB_5 O_（10）（0 ≤x≤ 1.0）。激发光谱和发射光谱证明，浓度饱和发生在一个高的Eu 3+浓度（~ 60大气压%）。所有的荧光粉都能发出明亮的红光，具有高的红/橙子比（2.7-3.1）和CIE坐标（0.64，0.36）。ZnLa0.4Eu0.6B5O10的原位高温光致发光光谱表明，其具有较高的热稳定性，在150 °C下的发光强度仍为室温下的90%，是一种适合于NUV-LED泵浦的红色荧光粉。
It is important to develop red phosphors which can be efficiently excited by near ultraviolet (NUV) irradiation, matching the wavelength of commercial LED chips. ZnLaB5O10possesses a significantly distorted coordination of La3+and suitable for the Eu3+incorporation, whose parity-forbidden law could be suppressed in such a coordination and be efficiently excited byf-ftransitions in the NUV range. ZnLa1-xEuxB5O10(0 ≤x≤ 1.0) were prepared by high temperature solid state reactions. Excitation and emission spectra prove that the concentration saturation occurs at a high Eu3+concentration (∼60 atm%). All the phosphors emit the bright red light with a high red-to-orange ratio (2.7–3.1) and CIE coordinate (0.64, 0.36). In-situ high temperature photoluminescence spectra of ZnLa0.4Eu0.6B5O10prove its high thermal stability, i.e. the emission intensity at 150 °C remains 90% of the value at room temperature, thus being a suitable candidate for NUV-LED pumped red phosphor.