Cathodoluminescence of Double Layers of Phosphor Particles
Cathodoluminescence of Double Layers of Phosphor Particles
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DOI：
10.1149/2.021404jss
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发表时间：
2014-01-01
影响因子：
2.2
通讯作者：
Silver, Jack
中科院分区：
文献类型：
--
作者：
den Engelsen, Daniel;Harris, Paul;Silver, Jack
我们目前的粒子层的ZnO：Zn，Y2 O3：Eu和Y2 O2 S：Eu轰击在阳极电压1和15 kV之间的电子辐射测量。本文中所描述的层是指单组分层、双层和双组分混合物。通过沉降将磷光体层沉积在ITO涂覆的载玻片上;通过分别对反射和透射模式下的辐射度和亮度求和来确定阴极射线发光的效率。在高电子能量下，在ZnO：Zn顶部的Y2 O3：Eu双层的效率显著大于其中两种组分混合的相应层的效率。这个结果被解释的渗透模型，它预测一个更大的效率为一个高电压的磷光体上的一个低电压的磷光体。当低压磷光体ZnO：Zn的层在高压磷光体Y2 O3：Eu的顶部时，我们还观察到比具有混合的两种组分的相应层的效率更高的效率。在这种情况下，由于抑制了Y2 O3：Eu层中的充电，效率提高。ZnO：Zn和Y2 O2 S：Eu的双层没有显示出增强的效率，因为Y2 O2 S：Eu颗粒的尺寸太大而不能引起穿透效应。(C)2014年电化学学会。All rights reserved.
We present radiance measurements of particle layers of ZnO:Zn, Y2O3:Eu and Y2O2S:Eu bombarded with electrons at anode voltages between 1 and 15 kV. The layers described in this work refer to single component layers, double layers and two component mixtures. The phosphor layers are deposited on ITO-coated glass slides by settling; the efficiency of the cathodoluminescence is determined by summing the radiances and luminances in the reflected and transmitted modes respectively. The efficiency of a double layer of Y2O3:Eu on top of ZnO:Zn at high electron energy is significantly larger than the efficiency of a corresponding layer in which the two components are mixed. This result is interpreted in terms of the penetration-model, which predicts a larger efficiency for a high-voltage phosphor on top of a low-voltage phosphor. When a layer of the low-voltage phosphor ZnO:Zn is on top of the high-voltage phosphor Y2O3:Eu, we also observe a higher efficiency than that of the corresponding layer with both components mixed. In this case the efficiency increases due to suppression of charging in the Y2O3:Eu layer. Double layers of ZnO:Zn and Y2O2S:Eu did not show enhanced efficiency, because the size of the Y2O2S:Eu particles was too large to evoke the penetration effect. (C) 2014 The Electrochemical Society. All rights reserved.