Triazolopyridine hybrids as bipolar host materials for green phosphorescent organic light-emitting diodes (OLEDs)

Vadagaonkar, Kamlesh S.; Yang, Chia Jung; Zeng, Wei Hao; Chen, Jian Hong; Patil, Bhausaheb N.; Chetti, Prabhakar; Chen, Li Yin; Chaskar, Atul

doi:10.1016/j.dyepig.2018.07.051

Cited by 27 publications

(8 citation statements)

References 59 publications

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“…Organic light-emitting diodes (OLEDs) are being widely used in solid-state lighting sources and flat panel displays, due to their standout characteristics, such as self-luminescence, low power consumption, high resolution, and high adaptability. – In particular, phosphorescent OLEDs (PhOLEDs) are attracting significant research interest because of their high internal quantum efficiency, as they can harvest both singlet and triplet excitons. – Furthermore, PhOLEDs utilize the host-dopant structure in the emitting layer to avoid concentration quenching and triplet–triplet annihilation. – As a result, the host materials are equally important as the doped emitters in determining the overall performance of the device. , …”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Phosphorescent Organic Light-Emitting Diodes Using Benzo[4′,5′]imidazo[2′,1′:2,3]imidazo[4,5,1-jk]carbazole as a Rigid and Effective Electron Acceptor in Bipolar Host

Raikwar

Kim

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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A novel bipolar host architecture was investigated to improve the external quantum efficiency (EQE) of green phosphorescent organic light-emitting diodes (PhOLEDs). The host was developed by incorporating carbazole as a hole-transport unit and fused rigid benzo[4′,5′]imidazo[2′,1′:2,3]imidazo[4, 5, 1-jk]carbazole (BzICz) as a new electron transport unit. The primary goal of the BzICz-based host design was to achieve a high triplet energy and bipolar charge transport characteristics. The green PhOLEDs fabricated using the new BzICz and carbazole-based host demonstrated a high EQE of 26.6% due to their high triplet energy and good bipolar charge transporting characteristics.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Phosphorescent Organic Light-Emitting Diodes Using Benzo[4′,5′]imidazo[2′,1′:2,3]imidazo[4,5,1-jk]carbazole as a Rigid and Effective Electron Acceptor in Bipolar Host

Raikwar

Kim

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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“…This subset of the triazolopyridine family can be prepared with a number of synthetic routes [2]. Some involve an oxidative ring closure [12][13][14][15][16][17] and others employ a transition metal catalysis [18,19].…”

Section: Introductionmentioning

confidence: 99%

3-(4-(Benzyloxy)-3-methoxyphenyl)-[1,2,4]triazolo[4,3-a]pyridine

Doherty

Sandoval

Mercier

et al. 2023

Molbank

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The [1,2,4]triazolo[4,3-a]pyridine derivative 3-(4-(benzyloxy)-3-methoxyphenyl)-[1,2,4]triazolo[4,3-a]pyridine was prepared in a 73% isolated yield by means of an oxidative ring closure of a hydrazine intermediate. Sodium hypochlorite was used as the oxidant and ethanol as a solvent, making the process a clean, green approach. The reaction was performed at room temperature for 3 h, and then the heterocycle was isolated in an analytically pure form by extraction, followed by passing the crude product mixture through a small plug of alumina.

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“…Moreover, bipolar host materials can provide proper carrier balance while supporting an effective carrier recombination at the emission layer [53][54][55][56][57]. Mostly, bipolar materials can be utilized for host materials as well as fluorescent emitters.…”

Section: Introductionmentioning

confidence: 99%

Fluorene–Triphenylamine-Based Bipolar Materials: Fluorescent Emitter and Host for Yellow Phosphorescent OLEDs

et al. 2020

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In this study, two new bipolar materials were designed and synthesized: N1-(9,9-diphenyl-9H-fluoren-2-yl)-N1-(4,6-diphenylpyrimidin-2-yl)-N4,N4-diphenylbenzene-1,4-diamine (FLU-TPA/PYR) and N1-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-N1-(9,9-diphenyl-9H-fluoren-2-yl)-N4,N4 diphenylbenzene-1,4-diamine (FLU-TPA/TRZ). We fabricated two different devices, namely a yellow phosphorescent organic light-emitting diode (PhOLED) and a non-doped fluorescent OLED emitter with both FLU-TPA/PYR and FLU-TPA/TRZ. The FLU-TPA/PYR host-based yellow PhOLED device showed better maximum current, power and external quantum efficiencies at 21.70 cd/A, 13.64 lm/W and 7.75%, respectively. The observed efficiencies were better than those of the triazine-based FLU-TPA/TRZ. The non-doped fluorescent device with the triazine-based FLU-TPA/TRZ material demonstrated current, power and external quantum efficiencies of 10.30 cd/A, 6.47 lm/W and 3.57%, respectively.

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Triazolopyridine hybrids as bipolar host materials for green phosphorescent organic light-emitting diodes (OLEDs)

Cited by 27 publications

References 59 publications

Highly Efficient Phosphorescent Organic Light-Emitting Diodes Using Benzo[4′,5′]imidazo[2′,1′:2,3]imidazo[4,5,1-jk]carbazole as a Rigid and Effective Electron Acceptor in Bipolar Host

Highly Efficient Phosphorescent Organic Light-Emitting Diodes Using Benzo[4′,5′]imidazo[2′,1′:2,3]imidazo[4,5,1-jk]carbazole as a Rigid and Effective Electron Acceptor in Bipolar Host

3-(4-(Benzyloxy)-3-methoxyphenyl)-[1,2,4]triazolo[4,3-a]pyridine

Fluorene–Triphenylamine-Based Bipolar Materials: Fluorescent Emitter and Host for Yellow Phosphorescent OLEDs

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