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已报导的三价稀土离子(RE~(3+))和二价锰离子发光的电致发光器件,都是激发机理为碰撞激发的高场发光器件。我们研究了znS:RE~(2+)的带边激发光谱,由此提出了实现正向注入下三价稀土离子电致发光的发光器件的设想,这种器件的必要条件是在存在三价稀土离子的区域同时注入电子和空穴。在离子注入的ZnS:Er~(3+)发光二极管上观察到了这种发光,实验证明不是碰撞激发,而是正向注入产生的发光。
The reports of trivalent rare earth ions (RE ~ (3+)) and electroluminescent devices emitting divalent manganese ions are all high field emission devices whose excitation mechanism is collision excitation. We studied the band-edge excitation spectra of znS: RE ~ (2+), and proposed the idea of realizing the light-emitting device of trivalent rare-earth ion electroluminescence under forward injection. The necessary condition of this device is that in the presence of trivalent Regions of rare earth ions inject electrons and holes simultaneously. This kind of luminescence was observed on ion-implanted ZnS: Er ~ (3+) light-emitting diodes. Experiments show that the luminescence generated by the positive injection is not collisional excitation.