Synthesis of new N-heteroaromatic attached tetraphenylethene based luminogens having aggregation induced emission and their applications in organic light emitting diodes

Date

2016-08-01

Author

ODABAŞ, Serhat
TEKİN, Emine
TÜRKSOY, Figen
Tanyeli, Cihangir

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Aggregation induced emission is an auxiliary property that can eliminate the aggregation caused quenching effect. It is a common undesired emission characteristic of most bulky aromatic molecules. Tetraphenylethene, with its unique features, is the most commonly studied molecule having aggregation induced emission property. In this work four N heteroaromatic attached tetraphenylethene derivatives were synthesized via inexpensive C-N bond formation reactions. The synthesized luminogens showed good thermal properties, having high Td values between 366 degrees C and 505 degrees C. All four tetraphenylethene derivatives exhibited excellent aggregation induced emission properties and there was an up to 200-fold increase in their fluorescence intensities. According to the time-resolved emission decay experimental analyses, all four luminogens showed two relaxation pathways in a THE - water mixture (10-90%). Non doped turquoise and light green OLED devices using the synthesized luminogens as a light emitting layer exhibited a maximum brightness up to 2600 cd/m(2), a maximum current efficiency up to 3.6 cd/A, turn on voltages between 7.0 and 10.0 V, and external quantum efficiencies up to 1.5%.

Subject Keywords

Electroluminescence, OLED, Tetraphenylethene, Aggregation induced emission, Photoluminescence

URI

https://hdl.handle.net/11511/40974

Collections

Department of Chemistry, Article