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从微结构和光电特性方面研究了一种新型硅基微腔的有机发光器件(SBM-OLEDs): 硅基多孔硅分布 Bragg 反射镜(PS-DBR)/SiO2/ITO/有机多层膜/LiF/Al(1 nm)/Ag. 微腔器件的重要组成部分 PS-DBR 由低成本、高效率的电化学腐蚀方法制备. 场发射扫描电子显微图清晰显示: SBM-OLEDs 具有纳米级层次结构和平整的界面. PS-DBR 反射谱的阻止带宽 160 nm, 且反射率达 99%.SBM-OLEDs 的反射谱中出现了标志此结构为微腔的共振腔膜. 在绿光和红光波段, 从 SBM-OLEDs 中都得到了改进的电致发光(EL)谱: 绿光(红光)EL 谱的半高宽可由无微腔的 83 nm (70 nm)窄化为有微腔时的 8 nm (12 nm), 且为单峰发射,微腔器件 EL 谱的色纯性有较大提高. 与非微腔器件相比, 发绿光和发红光的微腔在谐振波长处 EL的强度分别增强了 6倍和 4倍. 对微腔器件的电流-亮度-电压(I-B-V)特性和影响器件寿命的因素也进行了讨论.
A new kind of silicon-based microcavity organic light-emitting devices (SBM-OLEDs) has been studied in terms of microstructure and photoelectric properties: PS-DBR / SiO2 / ITO / LiF / Al (1 nm) / Ag PS-DBR, an important part of the microcavity device, is prepared by a low cost and high efficiency electrochemical corrosion method.Field emission scanning electron micrograph clearly shows that the SBM-OLEDs have a nanoscale hierarchical structure And a flat interface.The PS-DBR reflection spectrum has a blocking bandwidth of 160 nm and a reflectivity of 99% .A resonant cavity film is formed in the reflection spectrum of SBM-OLEDs, indicating that this structure is a microcavity. In the green and red bands , Improved electroluminescence (EL) spectra have been obtained from SBM-OLEDs: the half-height width of the green (red) EL spectrum can be narrowed from 83 nm (70 nm) without microcavities to 8 nm (12 nm), and it is single peak emission, the color purity of the EL spectrum of the microcavity device is greatly improved.Compared with the non-microcavity device, the green and red microchannels at the resonant wavelength EL Are 6 times and 4 times stronger respectively.The current-brightness-voltage (IBV) characteristics of microcavity devices and the factors affecting the lifetime of the devices are also discussed.