Control of electronic properties of triphenylene by substitution

Control of electronic properties of triphenylene by substitution
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通过取代控制苯并菲的电子性质

DOI:
10.1016/j.orgel.2011.10.005
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发表时间:
2012
影响因子:
3.2
通讯作者:
D. Hertel
D. Hertel
中科院分区:
工程技术3区
文献类型:
--
作者:
A. Thiessen;H. Wettach;K. Meerholz;F. Neese;S. Höger;D. Hertel

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本文报道了基于苯并菲的多环芳烃的电子性质的理论和实验研究。它们的聚集趋势被苯基或二苯基氨基取代所抑制。用含时密度泛函理论(TD-DFT)研究了取代基对吸收性质的影响。在对苯并菲核进行化学改性后,单重态-三重态能隙可以降低高达0.4eV。这一预测得到了光谱学的证实。作为这些材料的潜力的演示,Ir(III)掺杂的磷光有机发光二极管(OLED)进行了测试,并研究了性能的限制。我们实现了简单的,绿色发光的两层器件的效率超过30镉/A。
We report a joint theoretical and experimental study of the electronic properties of triphenylene based polycyclic aromatic hydrocarbons. Their aggregation tendency is suppressed by phenyl- or diphenylamino-substitution. The influence of the substituents on the absorption properties is investigated by time-dependent density functional theory (TD-DFT). Upon chemical modification of the triphenylene core, the singlet–triplet energy gap can be reduced by up to 0.4eV. This prediction is spectroscopically verified. As a demonstration of the potential of these materials, Ir(III) doped phosphorescent organic light-emitting diodes (OLEDs) are tested, and limits of the performance are investigated. We achieve efficiencies above 30Cd/A for simple, green-emitting two layer devices.
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影响因子: 41.2
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