1233491-85-4

Upstream product

• 750573-24-1 9,9’-(5-bromo-1,3-phenylene)bis(9H-carbazole) 
• 626-39-1 1,3,5-trisbromobenzene 
• 1082549-89-0 (9,9’-(5-(4,4,5,5-tetramethyl-1,2,3-dioxaborolan-2-yl)-1,3-phenylene)bis(9H-carbazole)) 
• 86-74-8 9H-carbazole 

Downstream Products

• 1233491-54-7 (9,9'-[(3,3'-Biphenyl-3,3'-yl-bipyridine)-1,3-biphenyl]bis-9H-carbazole) 
• 1352800-07-7 3',5'-di(carbazol-9-yl)-[1,1'-biphenyl]-3,5-dicarbonitrile 

Relevant academic research and scientific papers

A universal host material for high external quantum efficiency close to 25% and long lifetime in green fluorescent and phosphorescent OLEDs

High quantum efficiency close to 25% and long lifetime in green thermally activated delayed fluorescent and phosphorescent organic light emitting diodes are achieved using universal 3′,5′-di(carbazol-9-yl)-[1,1′- biphenyl]-3,5-dicarbonitrile host material

Highly efficient bipolar host materials towards solution-processable blue and green thermally activated delayed fluorescence organic light emitting diodes

New versatile host materials with good solubility in common organic solvents are greatly desired to promote solution-processable thermally activated delayed fluorescence organic light-emitting diodes. This paper describes the design and synthesis of two new host materials, namely 3′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3,5-diylbis(diphenylphosphine oxide) (CDPO) and 3′,5′-di-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3,5-diylbis (diphenylphosphine oxide) (mCPDPO), featuring hole-transporting carbazole and electron-transporting diphenylphosphine oxide (DPO) entities. The donor strength was varied to a constant n-type DPO core to tune the functional properties. The detailed studies proved that the resulting two new materials exhibit excellent solubility in common organic solvents, high triplet energy (>2.80 eV), high glass transition temperature (up to 133 °C), and good bipolar electronic nature. Consequently, both compounds were used as hosts in solution-processable blue and green thermally activated delayed fluorescence (TADF) OLEDs. In particular, the devices using mCPDPO as a host in the emissive layer showed outstanding performance with a maximum current efficiency, power efficiency, and external quantum efficiency of 35.3 cd A-1, 17.0 lm W-1 and 15.4percent in the blue-emitting diode, and 61.5 cd A-1, 29.7 lm W-1 and 18.8percent in the green-emitting diode, respectively. These results corroborated the potential of carbazole-phosphine oxide derivatives as host materials in solution-processable blue and green TADF OLEDs.

BIPOLAR ORGANIC MATERIAL AND OLED HAVING THE SAME

The present invention provides a bipolar organic material and an organic light emitting diode comprising the same. The bipolar organic material can be represented as the chemical formula 1. According to an embodiment of the present invention, the bipolar

Phosphorescent blue organic light-emitting diodes with new bipolar host materials

We report narrow band gap bipolar host materials, CbPr-3 (9,9'-[(3,3'-Biphenyl-3.3'-yl-bipyridine)- 1,3-biphenyl]bis-9H-carbazole) and Bim-4 (9,9'-[5-(1-phenyl-1H-benzimadazol-2yl)-1,3-phenylene] bis-9H-carbazole), for blue phosphorescent OLEDs applicatio