Tetraphenylsilane derivatives spiro-annulated by triphenylamine/carbazole with enhanced HOMO energy levels and glass transition temperatures without lowering triplet energy: host materials for efficient blue phosphorescent OLEDs

2013 ◽  
Vol 1 (3) ◽  
pp. 463-469 ◽  
Author(s):  
Cong Fan ◽  
Yonghua Chen ◽  
Zhongyin Liu ◽  
Zuoquan Jiang ◽  
Cheng Zhong ◽  
...  
Keyword(s):  
Glass Transition ◽  
Energy Levels ◽  
Transition Temperatures ◽  
Triplet Energy ◽  
Homo Energy ◽  
Glass Transition Temperatures ◽  
Host Materials ◽  
Blue Phosphorescent

Carbazolylphosphines and carbazolylphosphine oxides: facilely synthesized host materials with tunable mobilities and high triplet energy levels for blue phosphorescent OLEDs

2017 ◽  
Vol 5 (29) ◽  
pp. 7344-7351 ◽  
Author(s):  
Zifeng Zhao ◽  
Gang Yu ◽  
Qiaowen Chang ◽  
Xiaochen Liu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Energy Levels ◽  
Triplet Energy ◽  
Charge Mobility ◽  
Highly Efficient ◽  
Host Materials ◽  
Blue Phosphorescent

Selectively modulating the charge mobility of host materials by the oxidation of phosphines for highly efficient blue phosphorescent OLEDs.

scholarly journals Two novel blue phosphorescent host materials containing phenothiazine-5,5-dioxide structure derivatives

2018 ◽  
Vol 14 ◽  
pp. 869-874 ◽  
Author(s):  
Feng-Ming Xie ◽  
Qingdong Ou ◽  
Qiang Zhang ◽  
Jiang-Kun Zhang ◽  
Guo-Liang Dai ◽  
...  
Keyword(s):  
Energy Levels ◽  
Fluorescence Emission ◽  
Blue Fluorescence ◽  
Triplet Energy ◽  
Lumo Energy ◽  
Host Materials ◽  
Homo And Lumo ◽  
Homo And Lumo Energy ◽  
Very High ◽  
Blue Phosphorescent

Two novel D–A bipolar blue phosphorescent host materials based on phenothiazine-5,5-dioxide: 3-(9H-carbazol-9-yl)-10-ethyl-10H-phenothiazine-5,5-dioxide (CEPDO) and 10-butyl-3-(9H-carbazol-9-yl)-10H-phenothiazine-5,5-dioxide (CBPDO) were synthesized and characterized. The photophysical, electrochemical and thermal properties were systematically investigated. CEPDO and CBPDO not only have a high triplet energy but also show a bipolar behavior. Moreover, their fluorescence emission peaks are in the blue fluorescence region at 408 nm and the fluorescence quantum efficiency (Φ) of CEPDO and CBPDO were 62.5% and 59.7%, respectively. Both CEPDO and CBPDO showed very high thermal stability with decomposition temperatures (T d) of 409 and 396 °C as well as suitable HOMO and LUMO energy levels. This preferable performance suggests that CEPDO and CBPDO are alternative bipolar host materials for the PhOLEDs.

Properties of Random PSF/PES Copolymers as High-Performance Polymers

2011 ◽  
Vol 217-218 ◽  
pp. 1606-1610
Author(s):  
Dong Jiang ◽  
Xiao Ran Zhang ◽  
Yan Mei Ma ◽  
Cheng You Ma
Keyword(s):  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
High Performance ◽  
Molar Ratio ◽  
Transition Temperatures ◽  
Elongation At Break ◽  
Glass Transition Temperatures ◽  
High Performance Polymers ◽  
Diphenyl Sulfone

A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4, 4'-isopropylidendiphenol, 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-dichlorodiphenyl sulfone in the presence of K2CO3. We obtained a series of copolymers by changing the molar ratio of 4, 4΄-dihyolroxy diphenyl sulfone and 4, 4'-isopropylidendiphenol (it was marked as the ratio of S:A). The copolymers have the similar solubility with polyethersulfone. They also have high glass transition temperatures (Tg: 199°C~229°C) and 5% weight loss temperatures (4, 4'-isopropylidendiphenol: 4, 4΄-dihyolroxy diphenyl sulfone=1:1, Td5=497°C). At the same time the elongation at break is much higher than that of PES, while the tensile strength is a little lower than that of PES.

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