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Research Article | Online First

A record-breaking low turn-on voltage blue QLED via reducing built-in potential

Run Wang1, Hengyang Xiang1( ), Chi Zhang2, Hongyang Li1, Yuqin Su1, Qi Chen2( ), Qinye Bao3, Gaoran Li1, Haibo Zeng1( )
MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
School of Physics and Electronic Science East China Normal University, Shanghai 200241, China
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Abstract

Developing light-emitting diodes (LEDs) with the merits of low driving and high brightness has always been attractive. Considering the carrier dynamic process under electroexcitation, the built-in potential (Vbi) represents the moment that the photons start to be produced in a LED. However, it has not been carefully studied and discussed. Here, we observed that by employing an interface regulation strategy to enhance hole concentration, the Vbi of quantum dot LEDs (QLEDs) can be reduced. Combined with the characterization methods of Mott–Schottky (MS) and scanning Kelvin probe microscopy (SKPM), the key indicator of Vbi on driving voltage for QLEDs is confirmed. Profiting from the reduction of Vbi, a record-breaking ultra-low turn-on voltage of 2.2 V (@1 cd/m2) is achieved in a blue QLED. The blue QLED shows an advantage of high brightness under low driving voltages, i.e., 1000 cd/m2@3.10 V and 5000 cd/m2@3.88 V. This work proposes a reference strategy to predict and analyze the driving voltage issue, which is beneficial to facilitating the development of low-driving QLEDs in the future.

Keywords

built-in potentiallow turn-on voltagehigh brightnessquantum dot light-emitting diodes (QLEDs)

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Nano Research
DOI: 10.1007/s12274-024-6570-0
Cite this article:
Wang R, Xiang H, Zhang C, et al. A record-breaking low turn-on voltage blue QLED via reducing built-in potential. Nano Research, 2024, https://doi.org/10.1007/s12274-024-6570-0
Topics:
Light emitting diodes

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Received: 03 December 2023
Revised: 31 January 2024
Accepted: 17 February 2024
Published: 30 April 2024
© Tsinghua University Press 2024
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