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首页> 外文期刊>Journal of industrial and engineering chemistry >A high performance of BPhen-based white organic light-emitting devices with a dual-emitting layer and its electroluminescent spectral property
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A high performance of BPhen-based white organic light-emitting devices with a dual-emitting layer and its electroluminescent spectral property

机译：具有双发射层的基于BPhen的高性能白色有机发光器件及其电致发光光谱特性

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This work demonstrated the fabrication of white organic light-emitting devices (WOLEDs) using a dual emitting layer (d-EML) consisting of blue and 'white' emitters. In this d-EML system, the blue emitter not only emits but also assists the incomplete energy transfer. More importantly, it behaves as an effective trapping site for holes, which contributes to the efficient recombination of electron-hole pairs. The d-EML was constructed between the hole-transmitting layer (HTL) and the electron-transmitting layer (ETL) of Alq3 and BPhen. The thickness of the blue emitter used in the d-EML devices has an important effect on chromaticity and efficiency. Through the optimization of device structure, the reasonable white emission with Commission Internationale de L'Eclairage (CIE) color coordinates of (0.33,0.33) and little color shift was obtained. The device showed an applicable luminance with its maximum luminance of 22,874 cd/m~2 at a driving voltage of 16 V. The maximum luminance efficiency was achieved 8.10 cd/A, and the maximum power efficiency was reached 5.07 Lm/W. The result is explained with the help of the excitons generation and diffusion theory. According to the theory of excitons generation and diffusion, an equation has been set up which concerns electroluminescent spectra to the thickness of the two emitters and to the exciton diffusion length.
机译：这项工作证明了使用由蓝色和“白色”发射器组成的双发射层（d-EML）来制造白色有机发光器件（WOLED）。在此d-EML系统中，蓝色发射器不仅发射光，而且有助于不完全的能量传输。更重要的是，它充当空穴的有效俘获位点，有助于电子-空穴对的有效重组。 d-EML构造在Alq3和BPhen的空穴传输层（HTL）与电子传输层（ETL）之间。 d-EML器件中使用的蓝色发射器的厚度对色度和效率有重要影响。通过优化器件结构，获得了国际照明委员会（CIE）颜色坐标为（0.33,0.33）且发色少的合理白光发射。该器件在16 V的驱动电压下显示出可应用的亮度，其最大亮度为22,874 cd / m〜2。最大亮度效率达到8.10 cd / A，最大功率效率达到5.07 Lm / W。借助激子产生和扩散理论对结果进行了解释。根据激子产生和扩散的理论，建立了一个方程，该方程涉及电致发光光谱与两个发射体的厚度以及激子扩散长度之间的关系。

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