Oxetanyl-functionalized 9-aryl[3,3′]bicarbazolyl derivatives as building blocks for electro-active polymers

Lengvinaite, S.; Gražulevičius, Juozas V.; Grigalevičius, Saulius; Jankauskas, Vygintas

doi:10.1007/s10965-010-9469-2

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…There have been several classes of host materials developed to improve the device performances of PHOLEDs and representative core structure useful in PHOLEDs is bicarbazole with two carbazole units directly connected each other via C–C chemical bond. − The bicarbazole core can allow the development of thermally stable host materials − or hole transport materials − because of rigidity of the core and hosts owing to high triplet energy of the bicarbazole core.…”

Section: Introductionmentioning

confidence: 99%

Engineering of Interconnect Position of Bicarbazole for High External Quantum Efficiency in Green and Blue Phosphorescent Organic Light-Emitting Diodes

Kim

Lee

2014

ACS Appl. Mater. Interfaces

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Three bicarbazole based host materials with different interconnect positions between carbazole units, 3,3'-(9,9'-[3,3'-bicarbazole]-9,9'-diyl)dibenzonitrile (3CN33BCz), 3,3'-(9,9'-[3,4'-bicarbazole]-9,9'-diyl)dibenzonitrile (3CN34BCz), and 3,3'-(9,9'-[4,4'-bicarbazole]-9,9'-diyl)dibenzonitrile (3CN44BCz), were developed and their synthesis, material characterization, and device characterization were reported. Two carbazole units were connected via 3,3'-, 3,4'-, and 4,4'-positions to correlate the interconnect positions with photophysical properties and device performances. The linkage via 4,4'-position increased triplet energy and thermal stability of the host materials, while the linkage via 3,3'-position enhanced current density. All bicarbazole host materials showed good device performances and high quantum efficiency above 25% was attained using the biscarbazole derivatives for green and blue phosphorescent organic light-emitting diodes. In particular, the bicarbazole host materials with a linkage via 4-position showed high quantum efficiency above 30% in the green devices.

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