التفاصيل البيبلوغرافية
| العنوان: |
Design of carbazole-based platinum complexes with steric hindrance for efficient organic light-emitting diodes. |
| المؤلفون: |
Xu-Feng Luo, Sheng Ning, Hang He, Hao Tang, Liang-Jun Shen, Yi-Rui Shen, Hua-Bo Han, Xunwen Xiao, You-Xuan Zheng |
| المصدر: |
Dalton Transactions: An International Journal of Inorganic Chemistry; 10/14/2023, Vol. 52 Issue 38, p13670-13676, 7p |
| مصطلحات موضوعية: |
STERIC hindrance, LIGHT emitting diodes, CARBAZOLE, PLATINUM, PHENYL group, ELECTRON distribution |
| مستخلص: |
The construction of platinum complexes with high steric hindrance is expected to suppress triple-triplet annihilation and p-p stacking to achieve high-performance organic light-emitting diodes (OLEDs) with low efficiency roll-off. Herein, two large steric hindrance platinum complexes (N-CzPhPtacac and N-CzCF3PhPtacac) were prepared by taking advantage of steric hindrance between the phenyl group on carbazole and the functional group (phenyl and trifluoromethyl substituted phenyl) at the 3-position of a pyridine moiety. Due to the similar electron cloud distribution and gap difference between the HOMO and LUMO, the two complexes showed similar orange-red emission peaks at 590 and 596 nm with high PL quantum yields of 90% and 92% and short excited state lifetimes of 2.77 and 3.08 µs in doped films, respectively. Consequently, OLEDs based on N-CzPhPtacac and N-CzCF3PhPtacac showed maximum external quantum efficiency (EQEmax) values of 15.4% and 18.9%, respectively. Importantly, benefitting from the more stretched spatial configuration from the -CF3 effect, the corresponding OLED exhibited a lower efficiency roll-off, with an EQE of 18.1% at 1000 cd m-2. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
