New structure host material for phosphorescent OLED devices

New carbazole and quinoxaline based low molar mass bipolar derivative was synthesized, characterized, and tested as host derivative in phosphorescent organic light emitting diodes (OLEDs). The material could form homogeneous amorphous materials (layers) with very high glass transition temperature of...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2021-07, Vol.716 (1), p.69-75
Main Authors: Blazevicius, D., Krucaite, G., Tavgeniene, D., Griniene, R.
Format: Article
Language:English
Subjects:
Amorphous layer
Amorphous materials
carbazole
Carbazoles
Current efficiency
Emitters
Glass transition temperature
host material
Ionization
ionization potential
Ionization potentials
light emitting diode
Organic light emitting diodes
Phosphorescence
Photoelectric emission
Power efficiency
quinoxalin
Quinoxalines
Synthesis
Thermal decomposition
Transition temperatures
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Summary:New carbazole and quinoxaline based low molar mass bipolar derivative was synthesized, characterized, and tested as host derivative in phosphorescent organic light emitting diodes (OLEDs). The material could form homogeneous amorphous materials (layers) with very high glass transition temperature of 136 °C and also with very high initial thermal decomposition temperature of about 387 °C. The electron photoemission spectra of the layers of the synthesized compound showed ionization potentials of about 5.85 eV. The compound was tested as host material for green Ir(ppy) 3 , blue FIrpic, and yellow PO-01 triplet phosphorescent guests. The device with the yellow PO-01 triplet emitter exhibited the best overall performance. The most efficient yellow OLED demonstrated turn-on voltage of 4.9 V, a maximum brightness exceeding 4050 cd/m 2 and current efficiency of 10.8 cd/A with power efficiency of 6.9 lm/W at 100 cd/m 2 .
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2020.1859697