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


ODABAŞ S., TEKİN E., TÜRKSOY F., TANYELİ C.

JOURNAL OF LUMINESCENCE, vol.176, pp.240-249, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 176
  • Publication Date: 2016
  • Doi Number: 10.1016/j.jlumin.2016.03.031
  • Title of Journal : JOURNAL OF LUMINESCENCE
  • Page Numbers: pp.240-249
  • Keywords: Aggregation induced emission, Photoluminescence, Tetraphenylethene, OLED, Electroluminescence, ELECTROLUMINESCENCE, CONSTRUCTION, ELECTRONICS

Abstract

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%. (C) 2016 Elsevier B.V. All rights reserved.