Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters
JOURNAL OF MATERIALS CHEMISTRY C(2020)
摘要
Although organic light emitting devices (OLEDs) based on thermally activated delayed fluorescence (TADF) have already achieved impressively high external quantum efficiency (eta(ext)) of over 35%, their operation lifetime still needs to be improved for practical applications. In this study, we developed a molecular design for fabricating high triplet energy (E-T = 2.7 eV) multifunctional hole-transport layers (HTLs) based on a hexaphenylbenzene skeleton to realize record-breaking efficient and stable TADF OLEDs. By using a dibenzofuran-end-capped HTL named 4DBFHPB, we could successfully develop a highly efficient, low-drive voltage, and stable green TADF OLED exhibiting an eta(ext) of 19.2% and operation lifetime (LT50) of similar to 24 000 h at an initial luminance of 1000 cd m(-2). The drive voltage at 1000 cd m(-2) was recorded to be 4.07 V. We also developed a sky-blue TADF OLED exhibiting an eta(ext) of 21.5% and LT50 of similar to 1700 h at an initial luminance of 500 cd m(-2). The developed designs demonstrate record-breaking performances among the existing TADF OLEDs.
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关键词
Flexible OLED Technology,Organic Light-Emitting Diodes
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