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Xiaoke Liu

Associate Professor, Docent

My research mainly focuses on luminescent materials for electronic and photonic applications, especially light-emitting diodes (LEDs).

Profile

Dr. Xiaoke Liu (also known as Xiao-Ke Liu) received his PhD degree at the University of Chinese Academy of Sciences (China) in 2014. Then, he started postdoctoral research at the City University of Hong Kong (Hong Kong SAR, China). In 2016, he moved to Linköping University (Sweden) as a VINNMER Fellow and a Marie Skłodowska-Curie Fellow and became an Assistant Professor in 2018. He holds the title of Docent since 2022 and the position of Associate Professor at Linköping University since 2023. He was a Visiting Postdoc at the University of Cambridge (UK) in 2017/2018, and a Visiting Scholar at Nanyang Technological University (Singapore) in 2019.

He received research grants from Vinnova, EU Marie Skłodowska-Curie Actions, STINT, Swedish Research Council (VR), Carl Tryggers Foundation (CTS), etc.

He was recognized as an Outstanding Reviewer for Materials Horizons and a Top Peer Reviewer in Materials Science and Cross-Field.

Research

Light-emitting diodes (LEDs)

LEDs are a type of photonic device that converts electricity into light. They can be divided into several categories, mainly including inorganic LEDs, organic LEDs, quantum-dot LEDs, perovskite LEDs and carbon-dot LEDs.

Organic light-emitting diodes (OLEDs)

At the centre of my research in OLEDs is exciplex. Exciplex is an intermolecular charge-transfer excited state formed between an electron donor and an electron acceptor, generally with one of them in the singlet excited state (S1). Exciplex emission is usually inefficient and is observed at interfaces in OLEDs. For a very long time, exciplex emission was considered undesirable in OLEDs. My research focuses on the fundamental understanding of exciplex and the application of exciplex materials for highly efficient OLEDs, for instance, the formation mechanism of exciplex, the design of exciplex materials with thermally activated delayed fluorescence, and the use of exciplex as a multi-functional material in OLEDs. See relevant publications in Advanced Materials (2015), Advanced Materials (2015), Advanced Materials (2015), etc.

Perovskite LEDs

Metal halide perovskites are a class of compounds possessing the same type of crystal structure as CaTiO3. They have a general formula of ABX3, where A+ is a monovalent cation, B2+ is a divalent cation, typically Pb2+ and Sn2+, and X- is a halide anion. Metal halide perovskites are promising semiconductors for low-cost and high-efficiency optoelectronic devices. My research mainly focuses on developing novel perovskite materials (e.g., quasi-two-dimensional perovskites) for efficient and stable LEDs. See relevant publications in Nature Materials (2021), Nature Communications (2020), Advanced Materials (2019), Advanced Materials (2021), Advanced Materials (2023), Advanced Energy Materials (2018), Advanced Energy Materials (2022), etc.

Carbon-dot LEDs

Carbon dots are a new type of carbon-based nanomaterials. They have favourable attributes like abundance, low cost, eco-friendliness, good biocompatibility, high chemical flexibility, and appealing optical properties. My research interests lie in developing highly luminescent carbon dots as well as applying these materials in LEDs and other electronic and photonic devices.

See the full publication list at Google Scholar.

Publications

2024

Bei Yang, Xiaoke Liu, Li Wan, Wei-Xin Ni, Ni Yang, Jianhui Hou, Feng Gao (2024) The impact of reabsorption effect on composition analysis of organic semiconductors SCIENCE CHINA-MATERIALS, Vol. 67, p. 3124-3131 (Article in journal) Continue to DOI
Chencheng Peng, Ben Chen, Xiaoke Liu, Runda Guo, Zhiyuan He, Feihu Zhang, Xiping He, Liang Sun, Zhirong Liu, Yan Xiong, Feng Gao, Lei Wang (2024) High-Performance Thermally Evaporated Blue Perovskite Light-Emitting Diodes Enabled by Post-Evaporation Passivation Chemical Engineering Journal, Vol. 499, Article 155955 (Article in journal) Continue to DOI
Jionghua Wu, Renjie Wang, Rui Zhang, Giuseppe Portale, Eduardo Solano, Xiaoke Liu, Feng Gao (2024) Lattice reconstruction for mixed-halide blue perovskite light-emitting diodes with high brightness, outstanding color stability and low efficiency roll-off SCIENCE CHINA-MATERIALS, Vol. 67, p. 3553-3560 (Article in journal) Continue to DOI
Kang Wang, Jeong Hui Kim, Jie Yang, Xiaoke Liu, Yixuan Dou, Yuxuan Li, Weijian Tao, Haiyun Dong, Haiming Zhu, Kaifeng Wu, Li Na Quan, Feng Gao, Jianpu Wang, Letian Dou, Yong Sheng Zhao (2024) Luminescent metal-halide perovskites: fundamentals, synthesis, and light-emitting devices Science in China Series B: Chemistry, Vol. 67, p. 1776-1838 (Article, review/survey) Continue to DOI
Yuxuan Xiao, Qin Xue, Xiaoke Liu, Feng Gao, Guohua Xie (2024) Lead-free perovskite LEDs powered by cyanuric acid INNOVATION, Vol. 5, Article 100553 (Article in journal) Continue to DOI

News

Heyong Wang

Stable perovskite LEDs one step closer

Researchers at Linköping University, working with colleagues in Great Britain, China and the Czech Republic, have developed a perovskite light-emitting diode (LED) with both high efficiency and long operational stability.

How to build efficient organic solar cells

Twenty-five researchers from seven research institutes have put their heads together to draw up rules for designing high-efficiency organic solar cells. The research, led by associate professor Feng Gao, have been published in Nature Materials.

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