A high triplet energy, high thermal stability oxadiazole derivative as the electron transporter for highly efficient red, green and blue phosphorescent OLEDs

Shih, Chia-Lung; Rajamalli, Pachaiyappan; Wu, Cheng-An; Chiu, Ming-Jai; Chu, Li‐Kang; Cheng, Chien‐Hong

doi:10.1039/c4tc02348j

Cited by 60 publications

(37 citation statements)

References 40 publications

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“…Conversely, a higher electrochemical stability was determined for BP-2 upon repeating CV scans, the two reactive C 3 and C 6 sites in para -position relative to the nitrogen atom of the carbazole being blocked by the tert -butyl groups. In multilayered devices, the bluer emitter BP-1 provided efficiencies comparable to those obtained with iridium-based phosphorescent OLEDs at similar EL wavelength [ 85 – 86 ]. Notably, sky-blue BP-1 -based OLEDs reached a maximum efficiency of 24% for the light peaking at 488 nm.…”

Section: Reviewmentioning

confidence: 99%

Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

Bui¹,

Goubard²,

Ibrahim‐Ouali³

et al. 2018

Beilstein J. Org. Chem.

177

127

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The design of highly emissive and stable blue emitters for organic light emitting diodes (OLEDs) is still a challenge, justifying the intense research activity of the scientific community in this field. Recently, a great deal of interest has been devoted to the elaboration of emitters exhibiting a thermally activated delayed fluorescence (TADF). By a specific molecular design consisting into a minimal overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) due to a spatial separation of the electron-donating and the electron-releasing parts, luminescent materials exhibiting small S1–T1 energy splitting could be obtained, enabling to thermally upconvert the electrons from the triplet to the singlet excited states by reverse intersystem crossing (RISC). By harvesting both singlet and triplet excitons for light emission, OLEDs competing and sometimes overcoming the performance of phosphorescence-based OLEDs could be fabricated, justifying the interest for this new family of materials massively popularized by Chihaya Adachi since 2012. In this review, we proposed to focus on the recent advances in the molecular design of blue TADF emitters for OLEDs during the last few years.

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Section: Reviewmentioning

confidence: 99%

Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

Bui¹,

Goubard²,

Ibrahim‐Ouali³

et al. 2018

Beilstein J. Org. Chem.

177

127

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“…Material applications of 1,3,4-oxadiazole derivatives lie in several areas. They can be used as photosensitizers, [24] liquid crystals, [25][26][27] luminescent materials, [28][29][30] electron-transport materials, [31,32] polymers, [33,34] herbicides [35] and corrosion inhibitors. [36,37] Thanks to their high therapeutic importance and material applications, a number of 1,3,4-oxadiazole synthetic methods have been developed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis andin VitroAntimicrobial Activity Screening of New 3‐Acetyl‐2,5‐disubstituted‐1,3,4‐oxadiazoline Derivatives

Popiołek

Biernasiuk

Paruch

et al. 2019

Chemistry & Biodiversity

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Thirteen new 3‐acetyl‐2,5‐disubstituted‐1,3,4‐oxadiazoline derivatives were synthesized from corresponding hydrazide‐hydrazones of isonicotinic acid in the reaction with acetic anhydride. The obtained compounds were identified with the use of spectral methods (IR, 1H‐NMR, 13C‐NMR, MS). In vitro antimicrobial activity screening of synthesized compounds against a panel of bacteria and fungi revealed interesting antibacterial and antifungal activity of tested 1,3,4‐oxadiazoline derivatives, which is comparable to that of commonly used antimicrobial agents.

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“…The short excited-state lifetime of this molecule is lower than the highly emissive phosphorescent iridium complexes. 8 This is an important feature of TADF emitters that realizes high quantum efficiency and reduces non-radiative decay.…”

mentioning

confidence: 99%

A thermally activated delayed blue fluorescent emitter with reversible externally tunable emission

et al. 2016

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A high triplet energy, high thermal stability oxadiazole derivative as the electron transporter for highly efficient red, green and blue phosphorescent OLEDs

Abstract: A high glass transition, triplet energy gap and electron mobility material, TPOTP, is readily synthesized. It can serve as an efficient universal electron transporter and exciton blocker for blue, green and red phosphorescent OLEDs.

Cited by 60 publications

References 40 publications

Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

Recent advances on organic blue thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs)

Synthesis andin VitroAntimicrobial Activity Screening of New 3‐Acetyl‐2,5‐disubstituted‐1,3,4‐oxadiazoline Derivatives

A thermally activated delayed blue fluorescent emitter with reversible externally tunable emission

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