Comparison study of two isomers of benzimidazole for effective blue OLEDs

Gao, Yaohui; Chen, Chen; Tang, Qian; Su, Bin; Zhang, Gang; Bao, Bo; Jiang, Wen Long

doi:10.1007/s10854-017-6401-0

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Blue emitters can sometimes be utilized also as hosts to generate green or white light by energy transfer to an emissive compound [ 19 , 20 , 21 ]. Donor–acceptor derivatives of imidazole containing diphenylimidazole [ 22 , 23 ], pyrene-imidazole [ 24 , 25 , 26 ], phenanthroimidazole [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], benzimidazole [ 35 , 36 ], and theobromine [ 37 ] exhibit specific localization of molecular orbitals due to highly twisted molecular geometry and conformations. Consequently, these compounds can form a hybridized local charge transfer state (HLCT) [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] that can be exploited for practical electroluminescent applications, including blue-emitting OLEDs.…”

Section: Introductionmentioning

confidence: 99%

“…Donor–acceptor derivatives of imidazole containing diphenylimidazole [ 22 , 23 ], pyrene-imidazole [ 24 , 25 , 26 ], phenanthroimidazole [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], benzimidazole [ 35 , 36 ], and theobromine [ 37 ] exhibit specific localization of molecular orbitals due to highly twisted molecular geometry and conformations. Consequently, these compounds can form a hybridized local charge transfer state (HLCT) [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] that can be exploited for practical electroluminescent applications, including blue-emitting OLEDs. Recently, there has been a great deal of interest in the use of HLCT compounds including imidazole derivatives [ 34 , 38 ] as hosts in systems utilizing prompt fluorescent [ 34 ], TADF [ 39 ], phosphorescent [ 38 , 39 ] and HLCT [ 40 ] emitters.…”

Section: Introductionmentioning

confidence: 99%

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Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes

et al. 2022

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New derivatives of carbazole and diphenyl imidazole for potential multiple applications were synthesized and investigated. Their properties were studied by thermal, optical, photophysical, electrochemical, and photoelectrical measurements. The compounds exhibited relatively narrow blue light-emission bands, which is favorable for deep-blue electroluminescent devices. The synthesized derivatives of imidazole and carbazole were tested as fluorescent emitters for OLEDs. The device showed deep-blue emissions with CIE color coordinates of (0.16, 0.08) and maximum quantum efficiency of 1.1%. The compounds demonstrated high triplet energy values above 3.0 eV and hole drift mobility exceeding 10−4 cm2/V·s at high electric fields. One of the compounds having two diphenyl imidazole moieties and tert-butyl-substituted carbazolyl groups showed bipolar charge transport with electron drift mobility reaching 10−4 cm2/V·s at electric field of 8 × 105 V/cm. The synthesized compounds were investigated as hosts for green, red and sky-blue phosphorescent OLEDs. The green-, red- and sky-blue-emitting devices demonstrated maximum quantum efficiencies of 8.3%, 6.4% and 7.6%, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes

et al. 2022

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Structures and Photoluminescence Properties of Bis(aromatic amino)‐Based Isomers with Biphenyl as Bridge

Cui

Li³

et al. 2022

ChemistrySelect

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Herein, two series of isomers are developed based on biphenyl (BP) and two typical donor groups diphenylamine (DPA) and 9,9-dimethyl-9,10-dihydroacridine (DMAc) to figure out the isomerization effect on structures and photophysical properties. The computational simulations and photophysical analyses indicate that the substitution positions influence not only the molecular conformations but also the frontier molecular orbital distributions, which further influence the photoluminescence properties. We find that twisted structure is beneficial for the separation of the frontier molecular orbitals, while more planar structure contributes to higher luminescent intensity for both fluorescence and phosphorescence. Meanwhile, room temperature phosphorescence (RTP) is caught when these isomers are doped in 4,4'-dibromo-1,1'-biphenyl (DBBP). The p-DDPA/DBBP complex shows the highest intensity of phosphorescence and the longest lifetime (81.71 ms). The photoluminescence quantum yield of the p-DDPA/DBBP complex is as high as 54 % with RTP quantum efficiency approximately 12 %, which is 28 % for pure p-DDPA without afterglow.

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Structural analysis and third order non-linear optical investigation of red emitting luminescent aromatic nitro group appended 2-substituted Benzimidazoles

Sudha

Mabel

Easwaramoorthy

et al. 2023

Journal of Molecular Structure

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Comparison study of two isomers of benzimidazole for effective blue OLEDs

Cited by 4 publications

References 19 publications

Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes

Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes

Structures and Photoluminescence Properties of Bis(aromatic amino)‐Based Isomers with Biphenyl as Bridge

Structural analysis and third order non-linear optical investigation of red emitting luminescent aromatic nitro group appended 2-substituted Benzimidazoles

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