Optical and Electrical Analysis of Annealing Temperature of High-Molecular Weight Hole Transport Layer for Quantum-dot Light-emitting Diodes

Young Joon Han, Kunsik An, Kyung Tae Kang, Byeong Kwon Ju, Kwan Hyun Cho

Research output: Contribution to journalArticle

Abstract

In this study, we introduce optimization of the annealing conditions for improvement of hardness and hole transporting properties of high-molecular weight poly [9, 9-dioctylfluorene-co-N-(4-(3-methylpropyl)) diphenylamine] (TFB) film used as a Hole Transport Layer (HTL) of Quantum-dot Light-emitting Diodes (QLEDs). As annealing temperatures were increased from 120 °C to 150 °C or more, no dissolving or intermixing phenomena at the interface between HTL and Quantum-Dot Emission Layer (QDs EML) was observed. However, when the annealing temperatures was increased from 150 °C to 210 °C, the intensity of the absorbance peaks as determined by Fourier Transform Infrared (FT-IR) measurement was found to relatively decrease, and hole transporting properties were found to decrease in the measurement of current density - voltage (CD - V) and capacitance - voltage (C - V) characteristics of Hole Only Devices (HODs) due to thermal damage. At the annealing temperature of 150 °C, the QLEDs device was optimized with TFB films having good hardness and best hole transporting properties for solution processed QLEDs.

Original languageEnglish
Article number10385
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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molecular weight
light emitting diodes
quantum dots
annealing
temperature
hardness
capacitance-voltage characteristics
dissolving
current density
damage
optimization
electric potential

ASJC Scopus subject areas

  • General

Cite this

Optical and Electrical Analysis of Annealing Temperature of High-Molecular Weight Hole Transport Layer for Quantum-dot Light-emitting Diodes. / Han, Young Joon; An, Kunsik; Kang, Kyung Tae; Ju, Byeong Kwon; Cho, Kwan Hyun.

In: Scientific reports, Vol. 9, No. 1, 10385, 01.12.2019.

Research output: Contribution to journalArticle

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