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Exciplex elimination in an organic light-emitting diode based on a fluorene derivative by inserting 4,4’-N,N’-dicarbazole-biphenyl into donor/acceptor interface 下载免费PDF全文
Organic light-emitting diodes (OLEDs) composed of a novel
fluorene derivative of
2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)-6,7-difluoroquinoxaline (F2Py)
were fabricated, and exciplex emission was observed in the device.
To depress the exciplex in an OLED for pure colour light emission, 4,
4'-N,N'-dicarbazole-biphenyl (CBP) was inserted as a separator at the
donor/acceptor interface. It was found that the device without the CBP
layer emitted a green light peaking at 542~nm from the exciplex and a
shoulder peak about 430~nm from F2Py. In contrast, the OLED with CBP
layer emitted only a blue light peak at about 432~nm from F2Py.
Device efficiencies were calculated by a simulative mode in an
injection controlled type mechanism, and the results showed that
exciplexes yield much lower quantum efficiency than excitons. The
device with CBP has a higher power efficiency as no exciplex was
present. 相似文献
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采用一种新型的电子传输材料TFTTP作为阴极缓冲层提高基于SubPc/C60异质结的有机薄膜太阳能电池的性能. 通过在有机活性层和金属电极之间加入TFTTP界面层,器件的能量转换效率提高了约30%. 系统研究了器件的二极管特性、光电流特性以及内部的光场分布情况,结果表明,TFTTP阴极缓冲层的引入可以有效地提高器件的内建电场,进而增加电荷转移激子的分离效率. 通过使用TFTTP作为阴极缓冲层,在C60/金属界面形成良好的欧姆接触,降低了界面接触电阻,有利于自由载流子的收集. 相似文献
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红外辐射计用于红外热像仪测试设备的校准。介绍了一种用于红外辐射计的测量模块及方法。设计了采样保持的测量方案,通过参考信号生成采样脉冲,并将采样点设置在每个信号周期的1/4相位处,能显著提高微弱信号的测量能力。对于35℃的黑体辐射信号,通过与现有方案的对比实验,测量信号强度可提高57.6%;在红外热像仪测试设备背景温度为22℃条件下,通过与现有仪器的对比测试,测量信号精度可提升50%以上。 相似文献
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基于高温高压下面心立方(FCC)铁的状态方程和熔化温度实验数据,建立了热力学模型计算FCC铁、固-液混合相、液态铁在高温高压下的状态方程.在相同密度和温度下,计算的FCC铁、固-液混合铁、液态铁的压强与实验测量结果较为一致,且计算结果与实验结果平均偏差分别为-1.61 GPa、1.05 GPa、-0.05 GPa.在0~100 GPa压强范围内,当铁完全发生熔化时,随着压强的增大其密度变化由-7.5%下降至2.7%. 相似文献