Synthesis and Properties of New Imidazole Derivatives Including Various Chromophore for OLEDs

Two new blue compounds were successfully synthesized by introducing phenanthroimidazole group as a side group into pyrene, a chromophore with good luminous efficiency: 1-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (NA-PPI) and 1-(4'-(9H-carbazol-...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2019-07, Vol.687 (1), p.27-33
Main Authors: Sim, Yeonhee, Kang, Seokwoo, Shin, Donghee, Park, Miyeon, Kay, Kwang-Yol, Park, Jongwook
Format: Article
Language:English
Subjects:
blue emission
Chromophores
Electroluminescence
fluorescence
Imidazole
Luminous efficacy
Optical properties
Organic light emitting diodes
Organic light-emitting diode
Photoluminescence
Pyrene
Synthesis
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Summary:Two new blue compounds were successfully synthesized by introducing phenanthroimidazole group as a side group into pyrene, a chromophore with good luminous efficiency: 1-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (NA-PPI) and 1-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (CP-PPI). The optical and electroluminescence properties of newly synthesized materials were measured. Both materials emit blue or sky-blue photoluminescence in the film state and have a high PLQY value of over 80% in solution state. The synthesized materials were applied as EML in non-doped devices, and high efficiency of 3.51 cd/A and EQE of 2.39% in CP-PPI device were achieved.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2019.1648051