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Research Article

Unidirectionally aligned bright quantum rods films, using T-shape ligands, for LCD application

Maksym F. Prodanov 1,§, Chengbin Kang1,§, Swadesh K. Gupta1, Valerii V. Vashchenko1, Yuhao Li2, Minchao Qin2, Xinhui Lu2, Abhishek K. Srivastava1 ( )
State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Centre for Display Research, Department of Electronics and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong 999077, Hong Kong, China
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong 999077, Hong Kong, China

§ Maksym F. Prodanov and Chengbin Kang contributed equally to this work.

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Graphical Abstract

Highly concentrated aligned quantum rods (QRs) films of high brightness and emission polarization are designed. The brightness of the color converting film is ~ 550 nits. The color gamut and efficiency of liquid-crystal display (LCD) improved up to 121% of national television system committee (NTSC) and 7.9% correspondingly.

Abstract

Unidirectionally aligned nanorods (NRs) are of great importance for different applications, including displays, lighting, and photodetectors. Recently, many alignment techniques were studied to align quantum rods (QRs). However, the brightness of these films, due to the limited concentration of aligned quantum rods in the film, is not enough for their implementation as brightness enhancement films (BEFs) in displays. This can be ascribed to the poor miscibility of quantum rods in polymer and strong concentration dependence of the polarized emission. The ligands of NR are very important for the alignment and brightness. In this article, we proposed a ligand combination comprising T-shape promesogenic phosphonic acid, which on being photoaligned provides mutually parallel alignment of the quantum rods. The T-shape ligands enable the fabrication of hybrid films with a QRs concentration as high as 10 wt.%–20 wt.% retaining high brightness and luminescence polarization property. Later, we used these films in the in-plane switching (IPS) display backlight that shows the color gamut up to 121% of national television system committee (NTSC) (CIE1931), liquid-crystal display (LCD) efficiency up to 7.9%, power efficacy 103 ± 2 nits/W, and the high brightness of ~ 550 ± 10 nits. Thus, the proposed ligands can be used for the alignment of a variety of nanorods.

Keywords

quantum rods (QRs)ligandsalignmentdisplayluminous efficiency

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Nano Research
Volume 15 Issue 6,
June 2022
Pages 5392-5401
DOI: 10.1007/s12274-021-4019-2
Cite this article:
MFP, Kang C, Gupta SK, et al. Unidirectionally aligned bright quantum rods films, using T-shape ligands, for LCD application. Nano Research, 2022, 15(6): 5392-5401. https://doi.org/10.1007/s12274-021-4019-2
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Received: 19 July 2021
Revised: 23 November 2021
Accepted: 23 November 2021
Published: 08 February 2022
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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