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EL器件的绿红比是定性估计器件中过热电子能量的一种有效方法。但本文工作发现,发光中心的行为及状态对绿红比的影响很大。当掺杂浓度增加时,绿红地变小。从发光峰的衰减曲线看,红色峰衰减曲线的极大值比绿色峰衰减曲线的极大值滞后3us,这说明在掺杂浓度增加到一定值时,就会发生交叉驰豫现象,并且随发光中心浓度的增加,交叉驰豫的几率也增强。 相似文献
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介绍了新制备的TFEL发光材料ZnO(S):Ce^3 ,测量了它的PL和EL特性,结果显示:这种材抖的TFEL为Ce^3 的发光,有较好的颜色组成(446nm,493nm),可望用于监色TFEL. 相似文献
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In the forbidden band of the materials there aresome trap levels which is caused by i mpurities or de-fect structure inthe trapping materials[1,2].These ma-terials are characterized by these trap levels,where-fore it is significant to calculate the trap d… 相似文献
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A series of Y1–xPO4:x Tb3+(x=0.005–0.1) phosphors were successfully fabricated by using co-precipitation method with NH4H2PO4 as phosphorus source. The structure and morphology characterization of the luminescent material was investigated with X-ray powder diffraction(XRD) and field emission scanning electron microscopy(FESEM). The XRD patterns indicated that the samples belonged to tetragonal phase. Luminescence properties were discussed by measuring the excitation and emission spectra. The phosphor could be excited by UV light(340–390 nm) and emitted green light, with the emission peaks located at 491(5D4→7F6), 550(5D4→7F5), 589(5D4→7F4) and 624 nm(5D4→7F3). In addition, the p H value and activator concentration had great effects on the emission intensity. The results illuminated that this phosphor could be used for UV based white light emitting diodes and co-precipitation method could be used to prepare better appearance phosphor. 相似文献
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在空气中采用喷雾热解法合成了稀土铕(Eu)、铽(Tb)及铥(Tm)掺杂的铝酸锌(ZnAl_2O_4)发光膜,研究了合成条件对其阴极射线发光特性的影响。ZnAl_2O_4:Tb~(31)、ZnAl_2O_4:Tm~(3 )及ZnAl_2O_4:Eu~(31)膜分别发出主峰位于555 nm的绿光、主峰位于478 nm的蓝光及主峰位于616 nm的红光。上述发光均可在低退火温度(700℃以下)下获得,因此可以使用玻璃作为基底。同时研究了样品发光的色坐标和色纯度,并与标准的红、绿、蓝粉的色品度进行了比较。样品的亮度和效率都随外加电压的增加而增大,没有观察到亮度饱和现象。此外,Eu掺杂的ZnAl_2O_4膜在850℃以上、还原气氛中退火后呈现Eu~(2 )的特征发射——宽的蓝发射带。 相似文献