ZnS:Cu,Nd, Cl薄膜直流电致发光的激发态寿命和光谱强度

在真空中用共蒸发方法制的直流电致发光薄膜ZnS:Cu,Nd,Cl,实验中测量了它的可见和红外发射。本文研究了Nd3+离子的各个激发态的寿命各个辐射波长的发射强度与温度和外加电压的关系,发现导带中参与电致发光激发过程的热电子能量分布遵从玻尔兹曼函数,热电子平均能量是0.16eV左右,这个值和能量转换效率测量结果相一致。

THE LIFETIMES OF EXCITED STATES AND SPECTRAL INTENSITIES OF DCEL IN ZnS:Cu,Nd, Cl THIN FILMS

Visible and infrared d.c.e.l.emission has been observed in thin films of ZnS:Cu:Nd:Cl prepared by co-evaporation in vacuum.The lifetimes of the excited states of the Nd3+ ion and the emission intensities at various wavelengths have been studied as a function of temperature and applied voltage.The energy distribution of the conduction band hot electrons taking part in the electroluminescence excitation process has been shown to follow a Boltzmann function and the mean energy of the hot electrons has been found to be 0.16 eV,a value which is consistent with the measured energy conversion efficienicies.