Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
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DOI：
10.1038/s41566-020-00745-z
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发表时间：
2021-01-04
期刊：
影响因子：
35
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Chan, Chin-Yiu;Tanaka, Masaki;Adachi, Chihaya
有机发光二极管(OLED)是未来几代显示器(1，2)的一种很有前途的光源技术。尽管取得了很大的进展(3-12)，但生产出具有足够的颜色纯度、寿命和效率的蓝色OLED应用仍然具有挑战性。在这里，我们报道了纯蓝(国际委员会L的CIE坐标为0.13，0.16)OLED，具有高效率(在1000cdm(-2)处的外量子效率为32%)、窄发射(半高宽为19 nm)和良好的稳定性(在初始亮度1000cdm(-2)下18小时的初始亮度(LT95)的95%)。该设计基于两单元堆叠式串联超荧光OLED，具有改进的单重态激发态能量转移，从表现出热激活延迟荧光(TADF)的天蓝色辅助掺杂(TADF)称为异质供体类型TADF(HDT-1)到纯蓝色发射体。随着对器件制造和工艺的更严格控制，预计器件寿命将进一步提高，可与商用荧光蓝色OLED竞争。发射范围窄、稳定性提高的纯蓝色有机LED在显示应用方面显示出良好的前景。
Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display(1,2). Despite great progress(3-12), it is still challenging to produce blue OLEDs with sufficient colour purity, lifetime and efficiency for applications. Here, we report pure-blue (Commission Internationale de l' Eclairage (CIE) coordinates of 0.13, 0.16) OLEDs with high efficiency (external quantum efficiency of 32 per cent at 1,000 cd m(-2)), narrow emission (full-width at half-maximum of 19 nm) and good stability (95% of the initial luminacnce (LT95) of 18 hours at an initial luminance of 1,000 cd m(-2)). The design is based on a two-unit stacked tandem hyperfluorescence OLED with improved singlet-excited-state energy transfer from a sky-blue assistant dopant exhibiting thermally activated delayed fluorescence (TADF) called hetero-donor-type TADF(HDT-1) to a pure-blue emitter. With stricter control of device fabrication and procedures it is expected that device lifetimes will further improve to rival commercial fluorescent blue OLEDs.Pure-blue organic LEDs with narrow emission and improved stability show promise for display applications.