Efficient hole transport materials based on novel fused methoxynaphthyl phenanthrimidazole core structure were synthesised and characterized. Their device performances in phosphorescent organic light emitting diodes were investigated. The high thermal stability in combination with the reversible oxidation process made promising candidates as hole-transporting materials for organic light-emitting devices. Highly efficient Alq3-based organic light emitting devices have been developed using phenanthrimidazoles as functional layers between NPB [4,4-bis(N-(1-naphthyl)-N-phenylamino)biphenyl] and Alq3 [tris(8-hydroxyquinoline)aluminium] layers. Using the device of ITO/NPB/4/Alq3/LiF/Al, a maximum luminous efficiency of 5.99 cd A(-1) was obtained with a maximum brightness of 40,623 cd m(-2) and a power efficiency of 5.25 lm W(-1).
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Three fused polycyclic aryl fragments, namely, naphthyl, methoxynaphthyl, and pyrenyl have been used to construct blue-emissive phenanthroimidazole-functionalized target molecules, , 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(naphthalen-1-yl)-1-phenanthro[9,10-]imidazole (1), 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(1-methoxynaphthalen-4-yl)-1-phenanthro[9,10-]imidazole (2), and 1-(2,3-dihydrobenzo[][1,4]dioxin-6-yl)-2-(pyren-10-yl)-1-phenanthro[9,10-]imidazole (3). The up-conversion of triplets to singlets a triplet-triplet annihilation (TTA) process is dominant in these compounds due to 2 > . The pyrenyl dihydrobenzodioxin phenanthroimidazole (3)-based nondoped OLED exhibits blue emission (450 nm) with CIE (0.
View Article and Find Full Text PDFFused Methoxynaphthyl Phenanthrimidazole Semiconductors as Functional Layer in High Efficient OLEDs.
J Fluoresc
January 2016
Department of Chemistry, Annamalai University, Tamilnadu, Annamalainagar, 608002, India.
Efficient hole transport materials based on novel fused methoxynaphthyl phenanthrimidazole core structure were synthesised and characterized. Their device performances in phosphorescent organic light emitting diodes were investigated. The high thermal stability in combination with the reversible oxidation process made promising candidates as hole-transporting materials for organic light-emitting devices.
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