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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Use of space interlayer in phosphorescent organic light-emitting diodes to improve efficiency and reduce efficiency roll-off
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Use of space interlayer in phosphorescent organic light-emitting diodes to improve efficiency and reduce efficiency roll-off

机译：在磷光有机发光二极管中使用空间夹层以提高效率并减少效率下降

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摘要

Typical phosphorescent organic light-emitting diodes (PhOLEDs) encounter efficiency roll-off problems and detrimentally degrades the device performance for practical applications particularity at high-brightness lightening. Here, we report high efficiency and reduced efficiency roll-off PhOLEDs by employing both 4,4', 4 ''-tris-(N-carbazolyl)-triphenylamine (TCTA) and 1,3,5-tris(2-N-phenylbenzimidazolyl) benzene (TPBi) as transporting, hosting and space interlayer (SIL) materials. The use of SIL blending TCTA into TPBi enables the current efficiency roll-up from 57.8 to 60.1 cd A(-1) with luminance increasing from 10.0 to 1143.0 cd m(-2). In particular, the current efficiency drops < 10% from 1143.0 to 5020.0 cd m(-2). In addition, the red-emitting sensitized dye further demonstrates that the SIL is dominant in expanding the dual exciton formation zone and suppressing efficiency roll-off. Also, the hole/electron balance can be manipulated by adjusting the doping ratio of the two materials in the SIL.
机译：典型的磷光有机发光二极管（PhOLED）遇到效率下降的问题，并且由于在高亮度照明下的实际应用的特殊性而有害地降低了器件性能。在这里，我们报告了通过同时使用4,4'，4''-三（-N-咔唑基）-三苯胺（TCTA）和1,3,5-三（2-N-苯基苯并咪唑基）苯（TPBi）作为运输，托管和空间夹层（SIL）的材料。使用SIL将TCTA混合到TPBi中可以使电流效率从57.8 cd A（-1）累积到60.1 cd A（-1），而亮度从10.0 cd m（-2）增加到1143.0 cd m（-2）。特别是，电流效率从1143.0降至5020.0 cd m（-2）下降了<10％。此外，发红光的敏化染料进一步证明了SIL在扩大双激子形成区和抑制效率下降方面占主导地位。同样，可以通过调整SIL中两种材料的掺杂率来控制空穴/电子平衡。

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