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采用MEH-PPV和SiO2复合制成异质结固态阴极射线发光器件,获得了固态阴极射线发光的特征光谱-双峰谱带。在电场较低时为激子发光,符合分子理论;在电场较高时激子已严重离化,属于带-带跃迁,符合能带理论。利用改进的电桥测量出传导电流,并研究了固态阴极射线发光蓝色发光强度同传导电流的关系。在低电压区,发光强度同传导电流关系近似为线性,在高电压区,由于SiO2的二次特性更加突出,发光强度同传导电流关系表现出超线性。
Heterojunction solid-state cathode ray emitting devices were fabricated by the combination of MEH-PPV and SiO2, and the characteristic spectra of double-peaked spectra of solid-state cathode ray were obtained. When the electric field is low, the exciton emits light, which is in accordance with the molecular theory. At high electric field, the exciton has been severely ionized and belongs to the band-band transition, which conforms to the band theory. The conduction current was measured by the improved bridge, and the relationship between the luminescence intensity and conduction current of solid-state cathode ray was studied. In the low voltage region, the relationship between the luminous intensity and the conduction current is approximately linear. In the high voltage region, the secondary characteristic of SiO2 is more prominent, and the luminous intensity shows superlinearity with the conduction current.