- Simultaneous improvement of emission color, singlet-triplet energy gap, and quantum efficiency of blue thermally activated delayed fluorescent emitters using a 1-carbazolylcarbazole based donor
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Blue thermally activated delayed fluorescent (TADF) emitters having 1-carbazolylcarbazole based donor moieties were developed to resolve the low quantum efficiency and large singlet-triplet energy splitting issues of the linker free TADF emitters. Investigation of the 1-carbazolylcarbazole derived donors as the donor units of two blue TADF emitters in comparison with 3-carbazolylcarbazole demonstrated that the 1-carbazolylcarbazole based donors increased the triplet energy, decreased the singlet-triplet energy gap, blue-shifted the emission color, and enhanced the quantum efficiency of the blue TADF devices.
- Kim, Mounggon,Choi, Jeong Min,Lee, Jun Yeob
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- Heterocyclic Compound and Organic Light Emitting Device Comprising The Same
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The present invention provides a heterocyclic compound represented by chemical formula 1 and an organic light emitting device including the same. It is possible to improve quantum efficiency.
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Paragraph 0170; 0174-0176
(2020/09/09)
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- For organic electroluminescence device compounds and organic electroluminescent device
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The invention provides a compound used on an organic electroluminescent device and the organic electroluminescent device. The component is of a structure represented by formula (1). An X and a Y are groups which are selectively composed of carbazole which is replaced by independent alkyl or aryl, or not replaced and is represented by free formula (A), (B), (C), (D), or (E), benzpyrole carbazole, triphenylsily, diphenyl phosphine oxide. An RI, an R2 and an R3 are groups which are selectively composed of free hydrogen, alkyl with one to fifteen carbon, aryl with six to fifteen carbon, triphenylsily which is replaced by alkyl or aryl, or not replaced and is represented by formula (D) or (E) replaced and diphenyl phosphine oxide. M and n are independently to be zero or one, wherein a limiting condition is that the sum of m and n is equal to or larger than one. And Ar1 and Ar2 are groups which are selectively composed of phenyl which is replaced by independent alkyl or aryl, or not replaced, tolyl, naphthyl, fluorenyl, anthryl, and phenathryl.
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