601454-35-7Relevant academic research and scientific papers
Tetraphenylsilane group containing carbazoles as high triplet energy host materials for solution-processable PhOLEDs
?ner, Saliha,?ner, Ilker,Akdag, Haydar,Varlikli, Canan
, p. 917 - 929 (2015/10/29)
A series of solution processable, wide band-gap host materials composed of carbazole and tetraphenylsilane groups were designed and synthesized. Their thermal, electrochemical, and photophysical properties were fully investi- gated. The introduction of bulky tetraphenylsilane and tert-butyl groups around the carbazole led to high glass transition temperatures (Tg) between 120 and 204 ° C. The triplet energies (ET ) of the synthesized materials were examined by low temperature (77 K) photoluminescence studies and determined as ET > 2.6 for all compounds. Phosphorescent organic light-emitting devices with the ITO/PEDOT:PSS/EML/TPBi/Cs2CO3 /Al device structure were fabricated by using synthesized materials as the host and two kinds of phosphorescent emitters, FIrpic and Ir(ppy)3 , as the guests. The highest luminous and power efficiency values obtained by using FIrpic were 3.6 cd A -1 and 1.48 lm W -1 , respectively, with commission International de I'Eclairage (CIE) coordinates of (0.17, 0.36), whereas these values were 7.8 cd A -1 and 2.9 lm W -1 for the device structure when Ir(ppy)3 was used as the guest [CIE (0.28, 0.62)].
Durene-decorated CBP derivatives as phosphorescent hosts and exciton-blocking materials for efficient blue OLEDs
Deng, Lijun,Li, Jiuyan,Wang, Xinzeng,Zhang, Zhengchuan
, p. 19700 - 19708,9 (2020/08/31)
Two novel durene-containing molecules, 1,4-bis-[4-(9-carbazolyl)-phenyl]- durene (CPD) and 1,4-bis-{4-[9-(3,6-(di-tert-butyl)carbazoyl)]-phenyl}-durene (t-BuCPD), which are derived from 4,4′-bis(9-carbazolyl)biphenyl (CBP) by inserting durene in its biphenyl core, are designed and synthesized for use as host materials for blue phosphors in organic light-emitting diodes (OLEDs). Inserting durene in biphenyl causes a right-angle torsion between the durene and the adjacent phenyl groups due to the strong steric hindrance effect of the durene group, confining the effective π-conjugation on only one carbazole and one phenyl and increasing the triplet energies of CPD and t-BuCPD to over 3.0 eV. These durene-decorated molecules show higher thermal stabilities than many other CBP derivatives. Blue phosphorescent OLEDs were fabricated using CPD and t-BuCPD as triplet hosts and traditional iridium(iii)bis(4,6-(difluorophenyl) pyridinato-N,C2′)picolinate (Firpic) as a dopant and excellent performances were achieved. In particular, peak efficiencies of 26.2 cd A -1 and 14.8 lm W-1 were realized when CPD was used as both a host and exciton-blocking material. This is the first report using durene to tune the triplet energy levels of phosphorescent host materials.
High triplet energy polymer as host for electrophosphorescence with high efficiency
Chen, Yen-Chun,Huang, Guo-Sheng,Hsiao, Chung-Chin,Chen, Show-An
, p. 8549 - 8558 (2007/10/03)
We report the conjugated polymer P(tBu-CBP) as a host with high triplet energy (ET 2.53 eV) and suitable HOMO (5.3 eV) and LUMO (2.04 eV) energy levels. Upon doping with green and red emission Ir-complexes, it gives devices with high luminous a
