Synthesis and Characterization of Carbazole Core‐based Small Molecular‐Hole‐transporting Materials for Red Phosphorescent <scp>OLEDs</scp>

Fan, Jin Guo; Kim, Mi Jin; Nguyen, Quynh Pham Bao; Braveenth, Ramanaskanda; Ko, Haye Min; Han, Jeongwoo; Kim, Gyeong Woo; Kwon, Jang Hyuk; Chai, Kyu Yun

doi:10.1002/bkcs.10960

Cited by 3 publications

(1 citation statement)

References 16 publications

(17 reference statements)

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“…Phosphorescent materials have been used for the efficient harvesting of triplet excitons in organic light‐emitting diode (OLED) devices . In the case of red and green phosphorescent devices, phosphorescent dopants and host materials having excellent efficiencies and device lifetime characteristics have been developed and used in commercialized devices . However, in the case of blue phosphorescent devices, although theoretical levels with maximum external quantum efficiencies of ~30% have been reached, drawbacks remain for these devices, including the short lifetimes, high power consumption, and poor color purity because of the molecular structures of the phosphorescent hosts and dopant material, and operating environments requiring high electric fields …”

Section: Introductionmentioning

confidence: 99%

Blue Phosphorescent Organic Light‐emitting Diode Using a Novel Starburst‐type Donor and Acceptor Material as a Co‐host

Cha

Lee

Gong

2017

Bulletin Korean Chem Soc

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Starburst-type hole-transporting and electron-transporting materials, tris(3-(9H-carbazol-9-yl)phenyl)amine (TmCTA), 2,4,6-tri([1,1 0 -biphenyl]-3-yl)-1,3,5-triazine (1), 2,4,6-tris(3 0 -methyl-[1,1 0 -biphenyl]-3-yl)-1,3,5-triazine (2), and 2,4,6-tris(3 0 ,5 0 -dimethyl-[1,1 0 -biphenyl]-3-yl)-1,3,5-triazine (3) having high triplet energies and excellent thermal stabilities were synthesized. Deposited films of TmCTA, with 1, 2, or 3 as hosts, were doped with the blue phosphorescent dopant bis[2-(4,6-difluorophenyl)pyridinato-C 2 ,N](picolinato)iridium(III) (FIrpic) and their device characteristics were evaluated. In co-deposited films, the molecular weight ratio of TmCTA to 1, 2, or 3 was 1: 1, and these co-hosts formed exciplexes. By comparison with those of single-host systems, the PL spectra of the co-deposited films were red-shifted, suggesting that exciplexes are formed by the two constituent molecules. When doped with 10% FIrpic, TmCTA:1 device showed an external quantum efficiency (EQE) of 14.56% (maximum 16.46%) at 1000 cd/m 2 ; similar results were obtained for the remaining films. The EQE roll-offs in the co-host systems are much smaller than those of single-host device using TmCTA.

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Section: Introductionmentioning

confidence: 99%

Blue Phosphorescent Organic Light‐emitting Diode Using a Novel Starburst‐type Donor and Acceptor Material as a Co‐host

Cha

Lee

Gong

2017

Bulletin Korean Chem Soc

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Tetra‐substituted Dipolar Carbazoles: Tuning Optical and Electroluminescence Properties by Linkage Variation

et al. 2018

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Six isomeric carbazole derivatives featuring donors such as triphenylamine and carbazole and cyano acceptor are synthesized and characterized. Triphenylamine substituted compounds displayed longer wavelength absorption and emission and improved thermal stability when compared to their carbazole congeners. The compounds containing donors at 2,7‐position of carbazole core displayed negative solvatochromism in absorption while the other isomers showed solvent independent absorption profiles. Except the dye containing carbazole at 1,8‐positions, all the dyes exhibited solvatochromism in excited state. Within a series dyes containing donors at 1,8‐positions exhibited shorter wavelength absorption and emission due to the significant twisting of chromophores at 1,8‐positions. The dyes possessing donor at 2,7‐positions and cyano groups at 3,6‐positions showed best electroluminescence performance (external quantum efficiency, 4.1 %) in the series owing to their ability to utilize triplet excitons via hybridized local and charge transfer excited state.

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Three-Dimensional Modeling of Organic Light-Emitting Diodes Containing Molecules with Large Electric Dipole Moments

et al. 2021

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Synthesis and Characterization of Carbazole Core‐based Small Molecular‐Hole‐transporting Materials for Red Phosphorescent OLEDs

Cited by 3 publications

References 16 publications

Blue Phosphorescent Organic Light‐emitting Diode Using a Novel Starburst‐type Donor and Acceptor Material as a Co‐host

Blue Phosphorescent Organic Light‐emitting Diode Using a Novel Starburst‐type Donor and Acceptor Material as a Co‐host

Tetra‐substituted Dipolar Carbazoles: Tuning Optical and Electroluminescence Properties by Linkage Variation

Three-Dimensional Modeling of Organic Light-Emitting Diodes Containing Molecules with Large Electric Dipole Moments

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