Blue-emitting dendritic molecule with dual functionality as host and dopant for solution-processed white OLEDs with red-emitting material

Chae Yeong Kim, Jiwon Yoon, Suna Choi, Cheol Hun Jeong, Hyung Jong Kim, Ji Eun Jeong, Seong Keun Kim, Hyuna Lee, Han Young Woo, Jang Hyuk Kwon, Min Ju Cho, Dong Hoon Choi

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Abstract

In this study, a three-armed dendritic molecule, 1,3,5-tris(10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-9,9-diphenyl-9,10-dihydroacridin-2-yl)benzene (3PDPAc), was successfully synthesized and utilized as a blue dopant and its host of two-component white organic light-emitting diodes (WOLEDs). The high molecular weight of dendritic 3PDPAc showed an advantage in the production of rigid thin films with fine surface morphology after doping with red-emitting 7-(7,7-dimethyl-5,13,13-triphenyl-7,13-dihydro-5H-indeno[1,2-b]acridin-2-yl)benzo[c][1,2,5]thiadiazole-4-carbonitrile (IABTCN). Transient photoluminescence spectroscopy confirmed that 3PDPAc and IABTCN displayed conventional fluorescence behavior. Furthermore, it was possible to form a two-component emission layer with 3PDPAc and IABTCN when fabricating a WOLED. The WOLED device bearing 3PDPAc and IABTCN (99.5:0.5 wt. ratio) exhibited 3.80% of the maximum external quantum efficiency (EQE) and CIE coordinates of (0.33, 0.34) which indicates almost pure white emission. The chromaticity of white color emission could be tuned from cool white to warm white by varying the concentration of IABTCN. Moreover, the device with 3PDPAc and IABTCN has been observed to display emission stability because of the miscibility of the host and dopants. Thus, the dendritic structure of 3PDPAc is advantageous for fabrication of a rigid emitting layer.

Original languageEnglish
Article number116198
JournalSynthetic Metals
Volume258
DOIs
Publication statusPublished - 2019 Dec

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Keywords

  • Blend film
  • Dendritic molecule
  • Solution-process
  • White organic light-emitting diodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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