An intermediate unit (IMU) of tandem organic light-emitting diode (TOLED) can affect the emission spectral stability because of the different charge-carrier migration and outcoupling efficiency at intermediate/emitting unit interface. In this work, an IMU consisting of carbon 60 and copper(II) phthalocyanine, inserted between red-emitting unit and blue-emitting unit, were constructed and fabricated. We focus on the effect of the relative location of the red-emitting unit and blue-emitting unit in the device configuration on the emission spectral stability of TOLED. In the color-tunable TOLED, a maximum current efficiency of 20.4 cd/A, along with light-emitting spectra tuning from red emission at (0.63, 0.31) according to Commission Internationale de L’Eclairage coordinates at a bias of 10 V to white emission at (0.34, 0.27) at 22 V, is realized. Meanwhile, in the color-stable TOLED, a maximum current efficiency of 15.5 cd/A and a stable white emission at (0.31, 0.27) in a wide range of biases from 12 to 22 V are also obtained. This work might inspire a promising approach for the fabrication of color-tunable and color-stable OLEDs for both information display and solid-state lighting.

中文翻译：

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通过控制中/发射单元界面处的电荷载流子迁移和输出耦合效率来修改串联有机发光二极管的发射光谱稳定性

串联有机发光二极管（TOLED）的中间单元（IMU）会影响发射光谱的稳定性，因为中间/发射单元界面处的电荷载流子迁移和输出耦合效率不同。在这项工作中，构造并制造了由碳60和酞菁铜（II）组成的IMU，该IMU插入了红色发射单元和蓝色发射单元之间。我们着眼于器件配置中红色发射单元和蓝色发射单元的相对位置对TOLED发射光谱稳定性的影响。在彩色可调TOLED中，最大电流效率为20.4 cd / A，并且根据国际照明委员会的规定，发光光谱从（0.63，0.31）处的红色发射进行调谐，其偏置电压为10 V到白色在22 V时实现（0.34，0.27）的发射。同时，在颜色稳定的TOLED中，在12至22V的宽偏压范围内，也获得了15.5cd / A的最大电流效率和（0.31、0.27）处的稳定白光发射。这项工作可能会激发出一种有前途的方法来制造用于信息显示和固态照明的颜色可调和颜色稳定的OLED。