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首页> 外文期刊>Optical Materials >White light emission from Y_2SiO_5:Ce, Tb films excited by electroluminescence
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White light emission from Y_2SiO_5:Ce, Tb films excited by electroluminescence

机译:Y_2SiO_5:Ce,Tb薄膜通过电致发光激发白光

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摘要

In this work, we propose a simple electroluminescent device that emits white light from a single composition luminescent layer. The Y_2SiO_5:Ce, Tb phosphor film is produced by pulsed laser deposition and sandwiched between two electrodes to fabricate the electroluminescent device. The heterostructure consists basically of a ZnO:Ga layer (as the transparent electrode), a Y_2SiO_5:Ce_(0.0075), Tb_(0.04) phosphor film grown on BaTiO_3 ceramics and silver as the back electrode. Electroluminescence spectra from Y_2SiO_5:Ce show the characteristic blue (broad band) emission centered at λ_(em) = 440 nm (5d → ~7F_(5/2) electronic transition) while a well-defined green emission located at λ_(em) = 544 nm (~5D_4 → ~7F_5 electronic transition) is obtained from Y_2SiO_5:Tb. Moreover, in the Y_2SiO_5:Ce, Tb system a white emission is generated. From electro-optical measurements, we found threshold voltages of V_(th) ~ 50 V for the Y_2SiO_5:Tb and V_(th) ~100 V for the Y_2SiO_5:Ce phosphors. For the combined system (Y_2SiO_5:Ce, Tb), the green emission (from Tb ions) initiates at 150 V while the blue component (Ce ions) starts at V > 400 V, yielding white light emission in an energy transfer mechanism between Ce and Tb.
机译:在这项工作中,我们提出了一种简单的电致发光器件,该器件可从单一成分的发光层发出白光。 Y_2SiO_5:Ce,Tb荧光粉膜是通过脉冲激光沉积制成的,并夹在两个电极之间以制造电致发光器件。异质结构主要由ZnO:Ga层(作为透明电极),Y_2SiO_5:Ce_(0.0075),在BaTiO_3陶瓷上生长的Tb_(0.04)磷光膜和银作为背电极组成。 Y_2SiO_5:Ce的电致发光光谱显示特征性的蓝色(宽带)发射集中在λ_(em)= 440 nm(5d→〜7F_(5/2)电子跃迁),而清晰的绿色发射位于λ_(em)从Y_2SiO_5:Tb获得= 544 nm(〜5D_4→〜7F_5电子跃迁)。此外,在Y_2SiO_5:Ce,Tb系统中,产生白色发射。通过电光测量,我们发现Y_2SiO_5:Tb的阈值电压V_(th)〜50 V,Y_2SiO_5:Ce荧光体的阈值电压V_(th)〜100V。对于组合系统(Y_2SiO_5:Ce,Tb),绿色发射(来自Tb离子)在150 V时启动,而蓝色成分(Ce离子)在V> 400 V时启动,从而在Ce之间的能量转移机制中产生白光发射。和Tb。

著录项

  • 来源
    《Optical Materials》 |2006年第1期|p.47-50|共4页
  • 作者单位

    Posgrado en Fisica de Materiales CICESE-UNAM Km 107 Carretera Tijuana-Ensenada Ensenada BC Mexico 22860 Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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