Publication: Enhancement of performance of OLEDs using double indolo[3,2-b]indole electron-donors based emitter
Issued Date
2021-10-01
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00222313
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2-s2.0-85109012753
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Luminescence. Vol.238, (2021)
Suggested Citation
Sukanya Tongsuk, Ruttapol Malatong, Takdanai Unjarern, Chanikan Wongkaew, Panida Surawatanawong, Taweesak Sudyoadsuk, Vinich Promarak, Nopporn Ruangsupapichat Enhancement of performance of OLEDs using double indolo[3,2-b]indole electron-donors based emitter. Journal of Luminescence. Vol.238, (2021). doi:10.1016/j.jlumin.2021.118287 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76017
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Title
Enhancement of performance of OLEDs using double indolo[3,2-b]indole electron-donors based emitter
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Abstract
Recently, considerable efforts have been devoted to the improvement of fluorescent OLEDs because of their affordable cost and metal-free materials. Indolo[3,2-b]indole derivatives with a large planar rigid structure and great photophysical properties have attracted attentions as materials in a variety of organic electronics but their applications as OLEDs are still limited. Herein, we reported two new fluorescent OLEDs, i.e., 10,10'-(sulfonylbis(4,1-phenylene))bis(5-ethyl-5,10-dihydroindolo[3,2-b]indole) (DHID-DPS) and 2,8-bis(10-butylindolo[3,2-b]indol-5(10H)-yl)dibenzo[b,d]thiophene 5,5-dioxide (DHID-DBS), with a distorted donor-acceptor-donor structure bearing indolo[3,2-b]indole moieties as electron-donors. The DHID-DPS exhibited a smaller singlet-triplet energy gap (ΔEST = 0.18 eV) than DHID-DBS (ΔEST = 0.33 eV). In addition, DHID-DPS demonstrated the fluorescence quantum yield in doped films reaching to 32% as well as the evidence of thermally activated delayed fluorescence (TADF) properties. As a result, the optimized doped OLED by using DHID-DPS as an emitter achieved a maximum external quantum efficiency of 3.86% with a blue-green fluorescence as well as a high brightness up to 12860 cd m−2. This suggested that indolo[3,2-b]indole derivatives are potential candidates for donor moieties in OLED applications.