Quantum dot light-emitting diode using 2,2′-bis(N-carbazolyl)-9,9′-spirobifluorene as a morphologically and thermally stable hole-transporting material Article Swipe

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Toshimitsu Tsuzuki , Genichi Motomura , Toshihiro Yamamoto ·

YOU? · · 2016 · Open Access · · DOI: https://doi.org/10.1002/pssa.201600270

We investigated the morphology of vacuum-deposited films of hole-transporting materials 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) and 2,2′-bis(N-carbazolyl)-9,9′-spirobifluorene (CFL) on a colloidal quantum dot (QD) film by atomic force microscopy (AFM) and fabricated quantum dot light-emitting diodes (QD-LEDs) using CBP and CFL. Surface free energy of the QD film is lower than those of CFL and CBP. Low surface free energy of the QD film affects the wetting property of materials deposited on the QD film. From the AFM images, 3D island growth was observed in the CBP film, whereas planar growth was observed in the CFL film. We consider that the large molecular mass and the molecular shape of CFL with the perpendicular arrangement of the two bulky π-electron systems restrain the rearrangement of the molecules during vacuum deposition. The QD-LEDs using CBP or CFL as a hole-transporting material showed saturated green emission. Luminance of the QD-LED using CFL was higher than that of the QD-LED using CBP at high voltages. This resulted from thermal stability of the CFL. The external quantum efficiency of the QD-LED using CFL was 3.3% and was higher than that of the QD-LED using CBP because the CFL formed the smooth film on the QD film.

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Quantum dot Materials science Light-emitting diode Optoelectronics Diode Thin film Electroluminescence Nanotechnology Layer (electronics)

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Type: article
Language: en
Landing Page: https://doi.org/10.1002/pssa.201600270
OA Status: green
Cited By: 5
References: 13
Related Works: 10
OpenAlex ID: https://openalex.org/W2554583394

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DOI: https://doi.org/10.1002/pssa.201600270

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Title: Quantum dot light-emitting diode using 2,2′-bis(N-carbazolyl)-9,9′-spirobifluorene as a morphologically and thermally stable hole-transporting material

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Type: article

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Language: en

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Publication year: 2016

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Publication date: 2016-08-09

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Authors: Toshimitsu Tsuzuki, Genichi Motomura, Toshihiro Yamamoto

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Landing page: https://doi.org/10.1002/pssa.201600270

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OA status: green

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OA URL: https://zenodo.org/record/3447473

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Concepts: Quantum dot, Materials science, Light-emitting diode, Optoelectronics, Diode, Thin film, Electroluminescence, Nanotechnology, Layer (electronics)

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Cited by: 5

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Citations by year (recent): 2024: 1, 2023: 1, 2021: 1, 2020: 2

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References (count): 13

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Related works (count): 10

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