High thermal-stability benzocarbazole derivatives as bipolar host materials for phosphorescent organic light-emitting diodes

Chen, Yi; Liang, Wenqing; Choi, Wing Hong; Huang, Jinhai; Dong, Qingchen; Zhu, Fu Rong; Su, Jianhua

doi:10.1016/j.dyepig.2015.07.040

Cited by 23 publications

(6 citation statements)

References 34 publications

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“…Finally, the photo-physical properties, quantum yields and uorescence lifetime spectrometer of partial molecules were explored systematically. The data of absorption and photoluminescence wavelength, the molar absorption coefficients (3) and the excited state lifetimes (s) as well as quantum yields (F) of the selected compounds 3a, 4a, 4c, 4f, 4g and 5a 15 in CH 2 Cl 2 are listed in Table S-1. † As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Rhodium(iii)-catalyzed indole-directed carbenoid aryl C–H insertion/cyclization: access to 1,2-benzocarbazoles

et al. 2017

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Section: Resultsmentioning

confidence: 99%

“…1) could be employed to furnish green phosphorescent organic light-emitting diodes (OLED). 3 Pyranbased FPHs (B, Fig. 1)-containing molecular devices 4 exhibited red emission color.…”

Section: Introductionmentioning

confidence: 99%

Rhodium(iii)-catalyzed indole-directed carbenoid aryl C–H insertion/cyclization: access to 1,2-benzocarbazoles

et al. 2017

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“…Such 2D or quasi-2D perovskite films have small grain size and increased exciton binding energy, which is directly related to high PLQY. ,− Despite these efforts, several issues remain to be solved. First, defects in the perovskite thin film morphology and halide vacancies contribute to nonradiative recombination. − Second, the rough surface of a perovskite thin film generates leakage current and thereby a low-efficiency PeLED. − Third, it is important that appropriate selection of the HTL improves not only the charge balance but also the interface property between the EML and HIL. − …”

Section: Introductionmentioning

confidence: 99%

Improved Electroluminescence Performance of Perovskite Light-Emitting Diodes by a New Hole Transporting Polymer Based on the Benzocarbazole Moiety

Kang

Jillella

Jeong

et al. 2020

ACS Appl. Mater. Interfaces

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A new hole-transporting material, poly-2-(9Hcarbazol-9-yl)-5-(4-vinylphenyl)-5H-benzo[b]carbazole (PBCZCZ), was developed for perovskite light-emitting diodes (PeLEDs). This polymer, which is based on the benzocarbazole moiety, has good solubility in common solvents and enabled the fabrication of highly efficient multilayer perovskite devices. It has excellent film morphology and a high hole mobility of 3.67 × 10 −5 cm 2 V −1 s −1 , which made it possible to vary the device configuration. Green and sky-blue perovskite PeLEDs using PBCZCZ as the hole-transporting layer had current efficiencies and external quantum efficiencies (EQEs) of 43.90 cd A −1 and 8.67% for the green device and 9.07 cd A −1 and 4.04% for the skyblue device, respectively. The EQE of the green PeLEDs was about 2.5 times higher and that of the sky-blue PeLEDs was about 3 times higher than the device made with the commercial HTL of poly(9-vinylcarbazole) (PVK). The operational device lifetimes of the green and sky-blue PeLEDs made with PBCZCZ were about 4.1 and 4.8 times higher than the PVK-containing device, respectively.

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“…The intermediates 5-(dibenzo[b,d]furan-4-yl)-1Hindole (1) and 1-(2-bromophenyl)-5-(dibenzo[b,d]furan-4-yl)-1H-indole (2) were synthesized from raw materials according to the methods reported in the previous literature. 24 The desired product INDY can be obtained by the Suzuki crosscoupling reaction of the (4-(1-phenyl-1H-benzo[d]imidazol-2yl)phenyl)boronic acid with the bromide intermediates (2) in 73−76% yields. The intermediates and end product were characterized by 1 H and 13 C NMR spectral and mass spectrometry.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Novel Bipolar Indole-Based Solution-Processed Host Material for Efficient Green and Red Phosphorescent OLEDs

Chen

Xiang

Cao

et al. 2017

ACS Appl. Mater. Interfaces

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A new bipolar host material 2-(2'-(5-(dibenzo[b,d]furan-4-yl)-1H-indol-1-yl)-1,1'-biphenyl]-4-yl)-1-phenyl-1H-benzo[d]imidazole (INDY) has been designed and synthesized for solution-processed PHOLEDs. A hole-transporting indole conjugated dibenzofuran scaffold and an electron-transporting benzimidazole unit were orthogonally connected with incorporation of a 2,4'-biphenyl bridge, which endows a balanced bipolar charge transfer distribution and appropriate triplet energy level (>2.6 eV). The twisted conformation of INDY also ensures good thermal/morphological stability with high T (148 °C). The solution-processed green PHOLEDs achieved great device efficiencies with 27.33 cd/A and 12.26 lm/W at 7 V. Meanwhile, the red solution-processed PHOLEDs gained excellent performance with the maximum efficiencies of 17.20 cd/A, 9.82 lm/W, and 12.61%. In addition, all of the red devices presented excellent color stability with the same CIE coordinate as (0.65, 0.35) under varying dopant contents and operating voltages.

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High thermal-stability benzocarbazole derivatives as bipolar host materials for phosphorescent organic light-emitting diodes

Cited by 23 publications

References 34 publications

Rhodium(iii)-catalyzed indole-directed carbenoid aryl C–H insertion/cyclization: access to 1,2-benzocarbazoles

Rhodium(iii)-catalyzed indole-directed carbenoid aryl C–H insertion/cyclization: access to 1,2-benzocarbazoles

Improved Electroluminescence Performance of Perovskite Light-Emitting Diodes by a New Hole Transporting Polymer Based on the Benzocarbazole Moiety

Novel Bipolar Indole-Based Solution-Processed Host Material for Efficient Green and Red Phosphorescent OLEDs

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