In 2019 ADV OPT MATER published article about LIGHT-EMITTING-DIODES; CHARGE-TRANSFER; THIOXANTHONE DERIVATIVES; MOLECULAR DESIGN; ACCEPTOR; PHOTOLUMINESCENCE; IMPACT; OLEDS in [Wei, Xiaofang; Li, Zhiyi; Liu, Jianjun; Wang, Ruifang; Hu, Xiaoxiao; Wang, Pengfei; Wang, Ying] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China; [Wei, Xiaofang; Li, Zhiyi; Liu, Jianjun; Wang, Ruifang; Hu, Xiaoxiao; Wang, Pengfei; Wang, Ying] Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China; [Hu, Taiping; Duan, Ruihong; Liu, Jianjun; Yi, Yuanping] Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China in 2019, Cited 38. The Name is 2,4-Dichlorobenzoic acid. Through research, I have a further understanding and discovery of 50-84-0. Computed Properties of C7H4Cl2O2
Four donor-acceptor-donor region isomers (2,3-TXO-PhCz, 2,6-TXO-PhCz, 2,7-TXO-PhCz, and 3,6-TXO-PhCz) are designed. The substitution positions of the two PhCz units significantly impact the photophysical properties of the isomers, especially for the singlet-triplet energy splitting (Delta E-ST) and oscillator strength (f ). 2,3-TXO-PhCz exhibits weak emission due to the large steric hindrance of the two PhCz units. While 2,6-TXO-PhCz, 2,7-TXO-PhCz, and 3,6-TXO-PhCz all exhibit strong emission. The four emitters possess small Delta E-ST of 0.01-0.24 eV; the corresponding f values are 0.064, 0.107, 0.026, and 0.134. Consequently, the photoluminescence quantum yields (PLQYs) of the doped films in CBP host are: 62.1% for 2,3-TXO-PhCz, 83.8% for 2,6-TXO-PhCz, 89.0% for 2,7-TXO-PhCz, and 85.4% for 3,6-TXO-PhCz. Although notable divergences of f and Delta E-ST exist between 2,6-TXO-PhCz and 2,7-TXO-PhCz, similar PLQY of doped film in the CBP host, and exciton utilization and external quantum efficiency (EQE) of the corresponding devices can be achieved: 2,6-TXO-PhCz and 2,7-TXO-PhCz endow the organic light-emitting devices with high EQE of 23.2% and 24.4%. This proximity can be attributed to the synergistic effect of f and Delta E-ST. This finding highlights the beneficial role of the different linking positions on the acceptor unit in facilitating the adjustment of f and Delta E-ST in order to improve the device efficiency.
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Reference:
Chloride – Wikipedia,
,Chlorides – an overview | ScienceDirect Topics