A Cyan-Emitting BaSi7N10 : Eu2 + Phosphor Prepared by Gas Reduction and Nitridation for UV-Pumping White LEDs
A Cyan-Emitting BaSi7N10 : Eu2 + Phosphor Prepared by Gas Reduction and Nitridation for UV-Pumping White LEDs
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DOI：
10.1149/1.3424899
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发表时间：
2010-07
影响因子：
3.9
通讯作者：
Huili Li;R. Xie;Guohong Zhou;N. Hirosaki;Zhuo Sun
中科院分区：
文献类型：
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作者：
Huili Li;R. Xie;Guohong Zhou;N. Hirosaki;Zhuo Sun
以BaO-SiO2-Eu 2 O3系均相氧化物前驱体为原料，在流动的NH3和CH 4混合气体中，采用直接气体还原氮化法，成功地合成了Eu 2+激活的BaSi 7 N10青色荧光粉。研究了样品的物相纯度、形貌、化学组成和发光性能。讨论了激活剂浓度对Eu 2+在BaSi 7 N10中的光学性质的影响.合成的粉末具有接近纯的BaSi 7 N10相，由微米级颗粒组成。Eu 2+掺杂的BaSi 7 N 10荧光粉在电磁光谱的紫外部分具有强烈吸收，并表现出中心位于482-500 nm的强烈青色发射带，这与早期论文一致。Eu 2+浓度对材料的光学性质有很大的影响。在紫外光激发下，Eu 2+掺杂的BaSi 7 N10：Eu 2+荧光粉具有高的发光强度、高的量子效率和很低的热猝灭，是一种很好的紫外光泵浦白色LED用蓝绿色荧光粉。
An Eu 2+ -activated BaSi 7 N 10 cyan phosphor for UV-pumping white light-emitting diodes (LEDs) was successfully synthesized by direct gas reduction and nitridation of the homogeneous oxide precursor of a BaO-SiO 2 -Eu 2 O 3 system in flowing NH 3 and CH 4 mixture gas. The phase purity, morphology, chemical composition, and luminescence properties were investigated. The effect of activator concentration on the optical properties of Eu 2+ in BaSi 7 N 10 was discussed. The synthesized powders have a nearly pure BaSi 7 N 10 phase and consist of microsized particles. Eu 2+ -doped BaSi 7 N 10 phosphors absorb strongly in the UV part of the electromagnetic spectrum and exhibit an intense cyan emission band centered at 482-500 nm, which agrees with earlier papers. The optical properties depend greatly on the Eu 2+ concentration. Under an UV excitation, BaSi 7 N 10 :Eu 2+ phosphors doped with a 20 atom % activator give the best luminescent properties, such as high emission intensity, high quantum efficiency, and very low thermal quenching, which suggests that Eu 2+ -doped BaSi 7 N 10 can be a good green-blue phosphor for UV-pumping white LEDs.