In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 45, No. 41 ( 2021), p. 19381-19390
Kurzfassung:
Two 2,7-disubstituted spiro[fluorene-9,9′-xanthene] derivatives, 2,7-bis(4-(1-phenyl-1 H -benzo[ d ]imidazol-2-yl)phenyl)spiro[fluorene-9,9′-xanthene] (SFX-2BI) and 2,7-bis(4-(1-(4-( tert -butyl)phenyl)-4,5-diphenyl-1 H -imidazol-2-yl)phenyl)spiro[fluorene-9,9′-xanthene] (SFX-2IM), were synthesized by grafting imidazole-derived moieties with different electron-withdrawing abilities onto the 2- and 7-positions of a spiro[fluorene-9,9′-xanthene] (SFX) core. Their photophysical and electrochemical properties, thermal stability and electroluminescent properties were investigated. The results showed that these compounds have excellent thermal stability and exhibit strong deep-blue emission in dichloromethane solution. In addition, the vacuum-processed doped and non-doped devices based on SFX-2BI and SFX-2IM were fabricated, in which the device prepared using SFX-2BI as the emitting material exhibited the best device performance with a turn-on voltage of 5.5 V, a maximum brightness of 3984 cd m −2 , a maximum current efficiency of 3.65 cd A −1 and a maximum external quantum efficiency of 2.61%.
Materialart:
Online-Ressource
ISSN:
1144-0546
,
1369-9261
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
1472933-7
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