Synthesis and Application of Thiadiazoloquinoxaline-Containing Chromophores as Dopants for Efficient Near-Infrared Organic Light-Emitting Diodes
Synthesis and Application of Thiadiazoloquinoxaline-Containing Chromophores as Dopants for Efficient Near-Infrared Organic Light-Emitting Diodes
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含噻二唑喹喔啉发色团的合成及其作为高效近红外有机发光二极管掺杂剂的应用
DOI：
10.1021/jp809568a
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发表时间：
2009-01-29
影响因子：
3.7
通讯作者：
Wang, Zhi Yuan
中科院分区：
文献类型：
--
作者：
Qian, Gang;Zhong, Ze;Wang, Zhi Yuan
以[1，2，5]噻二唑并[3，4-g]喹喔啉（TQ）为电子受体，三苯胺为电子给体，合成并表征了一系列供体-受体-供体型近红外荧光生色团。通过引入侧苯基或改变TQ核中的π共轭长度，我们调谐了这些发色团的能级，导致在784至868 nm范围内的NIR发射。高的热稳定性和玻璃化转变温度使得这些发色团可以用作掺杂剂发光体，其可以通过气相沉积来制备具有ITO/MoO 3/NPB/Alq（3）：掺杂剂发光体/BCP/Alq（3）/LiF/Al多层结构的有机发光二极管（OLED）。在2wt%掺杂剂1的情况下，LED器件在752 nm处显示出排他性NIR发射，在宽范围的电流密度（例如，大约200 mA cm（-2））。当工作电压为15 V时，辐射亮度达到最大值2880 mW Sr-1 m（-2）。
A series of a donor-acceptor-donor type of near-infrared (NIR) fluorescent chromophores based on [1,2,5]thiadiazolo[3,4-g]quinoxaline (TQ) as an electron acceptor and triphenylamine as an electron donor are synthesized and characterized. By introducing pendent phenyl groups or changing the pi-conjugation length in the TQ core, we tuned tile energy levels of these chromophores, resulting in the NIR emission in a range from 784 to 868 nm. High thermal stability and glass transition temperatures allow these chromophores to be used as dopant emitters, which can be processed by vapor deposition for the fabrication of organic light-emitting diodes (OLEDs) having the multilayered structure of ITO/MoO3/NPB/Alq(3):dopant emitter/BCP/Alq(3)/LiF/Al. The electroluminescence spectra of the devices based on these new chromophores cover a range from 748 to 870 nm. With 2 wt % of dopant 1, the LED device shows an exclusive NIR emission at 752 nm with the external quantum efficiency (EQE) as high as 1.12% over a wide range of current density (e.g., around 200 mA cm(-2)). The radiance reaches the largest value of 2880 mW Sr-1 m(-2) at an operating voltage of 15 V.