Performance Improvement of Gate-Tunable Organic Light-Emitting Diodes with Electron-Transport and Hole-Blocking Layers,ACS Applied Electronic Materials

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Performance Improvement of Gate-Tunable Organic Light-Emitting Diodes with Electron-Transport and Hole-Blocking Layers
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsaelm.0c00093
Huaping Li ₁ , Lili Zhou ₁

Affiliation

The current density and luminance of gate-tunable organic light-emitting diodes (OLEDs) can be modulated by application of an external gate potential. However, existing gate-tunable OLEDs require further optimization to make them suitable for practical use. In this work, the rapid electron conduction of 4,4′-bis(N-carbazolyl)-1,1’biphenyl (CBP) molecules under low operating potential is demonstrated in polymer electrolyte-coated super yellow (SY) polymer light-emitting diodes (PLEDs). This behavior is attributed to the facile electrochemical n-doping of CBP by the polymer electrolyte infiltrated into the SY PLED through the porous aluminum cathode. The field-modulated conductivity of CBP upon applying an external gate potential to electrolyte-gated (EG) PLEDs is demonstrated. These phenomena lead to the improved performance of EG SY PLEDs with a CBP electron-transport layer and 1,3,5-tris[(3-pyridyl)-phen-3-yl]benzene) (TmpypB) hole-blocking layer between the porous aluminum cathode and SY emissive layer, including low turn-on voltage (1.5 V), low current density leakage (0.01 mA/cm²), low off luminance (<0.01 cd/m²), saturated on-current density (2 mA/cm²) and on-luminance (100 cd/m²), and largely suppressed hysteresis. These results pave the path for practical application of EG OLEDs in displays, especially near-to-eye displays.

中文翻译：

具有电子传输和空穴阻挡层的可栅极可调的有机发光二极管的性能改进

栅极可调有机发光二极管（OLED）的电流密度和亮度可以通过施加外部栅极电势来调节。但是，现有的栅极可调OLED需要进一步优化以使其适合实际使用。在这项工作中，在聚合物电解质涂层超黄（SY）聚合物发光中证明了4,4'-双（N-咔唑基）-1,1'联苯（CBP）分子在低工作电势下的快速电子传导。二极管（PLED）。该行为归因于通过多孔铝阴极渗透到SY PLED中的聚合物电解质对CBP的电化学n掺杂的简便性。说明了在将外部栅极电势施加到电解质门控（EG）PLED时CBP的场调制电导率。²），截止亮度低（＜0.01 cd / m ²），饱和导通电流密度（2 mA / cm ²）和导通亮度（100 cd / m ²），并大大抑制了磁滞。这些结果为将EG OLED实际应用到显示器（尤其是近眼显示器）铺平了道路。

更新日期：2020-04-01

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