Highly efficient chrysene emitters based on optimized side groups for deep blue emission

Kang, Seokwoo; Lee, Hayoon; Jung, Hyocheol; Jo, Minjin; Jung, Min Kyo; Park, Jong‐Wook

doi:10.1016/j.dyepig.2018.04.016

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…Until now, there have only been a few reported deep blue emitters and the corresponding highly efficient and stable OLEDs with satisfactory chromaticity coordinates . The problem is both in the wide band gap of high-energy blue OLEDs and in the often occurring unbalance in electron and hole mobilities due to the mismatch in the positions of the energy levels in the organic light-emitting heterostructures . Moreover, the short-wavelength deep blue emission corresponding to the energy near 3.10 eV significantly increases the probability of molecular degradation by light reabsorption, which adversely affects the long-term stability of blue OLED.…”

Section: Introductionmentioning

confidence: 99%

“…22 The problem is both in the wide band gap of high-energy blue OLEDs and in the often occurring unbalance in electron and hole mobilities due to the mismatch in the positions of the energy levels in the organic light-emitting heterostructures. 23 Moreover, the shortwavelength deep blue emission corresponding to the energy near 3.10 eV significantly increases the probability of molecular degradation 24 these problems can be reached by the development of highperformance blue emitters with donor−acceptor (D−A) structures with the narrow spectral distribution of emission and small full width at half-maximum (fwhm) and capability of transporting both electrons and holes. Such a strategy can promote fluorescence efficiency, but can cause a bathochromic effect of the emission spectra.…”

Section: ■ Introductionmentioning

confidence: 99%

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(Tetrafluorovinylphenyl)carbazole as a Multifunctional Material for OLED Applications

Ivaniuk

Stakhira

Yaremchuk

et al. 2023

ACS Appl. Electron. Mater.

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The multifunctional materials for application in organic light-emitting devices (OLEDs) based on a single structural motif are very desired but quite rare species. Such structures allow simplifying the chemical variety within OLED heterostructures and thus reducing their cost, manufacturing time, and logistic efforts. In this paper, we report the 9-(2,3,5,6-tetrafluoro-4-vinylphenyl)carbazole molecule (Cz4FS) utilized as a fluorescent emitter, host material for quantum dot based OLEDs (QLEDs), acceptor part of the exciplex active layer, and monomer that can be used for the preparation of emissive polymers and copolymers. The external quantum efficiency (EQE) of the corresponding fluorescent OLED based on a Cz4FS single emitter doped into a 1,3-bis(carbazol-9-yl)benzene matrix is 4.2%, which is close to the theoretical limit and maximum brightness at the level of 3600 cd/m2. An OLED based on exciplex emission obtained utilizing Cz4FS as an acceptor demonstrates higher efficiency (5.3%) and much higher brightness near 25 000 cd/m2. A QLED based on Cz4FS as a host for CdSeS/ZnS core–shell quantum dots demonstrates excellent energy transfer from the Cz4FS matrix that results in a clear spectrum of quantum dots with an EQE of 2.3%, maximum of 19 000 cd/m2, and narrow spectral distribution. An OLED based on a Cz4FS-based polymer and copolymer demonstrates not extraordinary efficiency but low-efficiency roll-off in a wide range of current densities.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

(Tetrafluorovinylphenyl)carbazole as a Multifunctional Material for OLED Applications

Ivaniuk

Stakhira

Yaremchuk

et al. 2023

ACS Appl. Electron. Mater.

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“…Organic light-emitting diodes (OLEDs) have received much attention in industry and academia because of their self-emission, fast response, flexibility, and full-color emission abilities [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Research on organoboron emitters containing an oxygen atom or nitrogen atom as new emitter candidates has been strongly focused on blue emitters.…”

Section: Introductionmentioning

confidence: 99%

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

et al. 2022

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Two new deep-blue emitters with bipolar properties based on an organoboron acceptor and carbazole donor were newly synthesized: 2-(9H-carbazol-9-yl)-5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-5H-benzo[b]carbazole (TDBA-BCZ) and 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-8-phenyl-5,8-dihydroindolo[2,3-c]carbazole (TDBA-PCZ). The two emitters showed deep-blue and real-blue photoluminescence emission in their solution and film states, respectively. The doped spin-coated films were prepared using synthesized materials and showed a root-mean-square roughness of less than 0.52 nm, indicating excellent surface morphology. The doped devices, fabricated via a solution process using TDBA-BCZ and TDBA-PCZ as the dopants, showed electroluminescence peaks at 428 and 461 nm, corresponding to the Commission Internationale de L’éclairage (CIE) coordinates of (0.161, 0.046) and (0.151, 0.155), respectively. The external quantum efficiency (EQE)/current efficiency (CE) of the solution-processed forward devices, with TDBA-BCZ and TDBA-PCZ as dopants, were 7.73%/8.67 cd/A and 10.58%/14.24 cd/A, respectively. An inverted OLED device fabricated using rod-shaped ZnO nanoparticles as an electron injection layer showed a CE of 1.09 cd/A and an EQE of 0.30%.

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Azide Radical Initiated Ring Opening of Cyclopropenes Leading to Alkenyl Nitriles and Polycyclic Aromatic Compounds

Muriel

Waser

2021

Angewandte Chemie

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We report herein a radical‐mediated amination of cyclopropenes. The transformation proceeds through a cleavage of the three‐membered ring after the addition of an azide radical on the strained double bond and leads to tetrasubstituted alkenyl nitrile derivatives upon loss of N2. With 1,2‐diaryl substituted cyclopropenes, this methodology could be extended to a one‐pot synthesis of highly functionalized polycyclic aromatic compounds (PACs). This transformation allows the synthesis of nitrile‐substituted alkenes and aromatic compounds from rapidly accessed cyclopropenes using only commercially available reagents.

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Highly efficient chrysene emitters based on optimized side groups for deep blue emission

Cited by 14 publications

References 27 publications

(Tetrafluorovinylphenyl)carbazole as a Multifunctional Material for OLED Applications

(Tetrafluorovinylphenyl)carbazole as a Multifunctional Material for OLED Applications

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

Azide Radical Initiated Ring Opening of Cyclopropenes Leading to Alkenyl Nitriles and Polycyclic Aromatic Compounds

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