Photo of Xiaoke Liu

Xiaoke Liu

Associate Professor, Docent

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


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 SkÅ‚odowska-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.


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 LEDsSee 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.



Yuxuan Xiao, Qin Xue, Xiaoke Liu, Feng Gao, Guohua Xie (2024) Lead-free perovskite LEDs powered by cyanuric acid INNOVATION, Vol. 5, Article 100553 Continue to DOI


Jian Qing, Sankaran Ramesh, Xiaoke Liu, Heyong Wang, Hongling Yu, Chaoyang Kuang, Lintao Hou, Wenjing Zhang, Tze Chien Sum, Feng Gao (2023) Spacer cation engineering in Ruddlesden-Popper perovskites for efficient red light-emitting diodes with recommendation 2020 color coordinates Applied Surface Science, Vol. 616, Article 156454 Continue to DOI
Zhan Chen, Xiaoke Liu, Heyong Wang, Xianjie Liu, Lintao Hou, Feng Gao (2023) Photoluminescence Enhancement for Efficient Mixed-Halide Blue Perovskite Light-Emitting Diodes Advanced Optical Materials, Vol. 11, Article 2202528 Continue to DOI
Lixiu Zhang, Luyao Mei, Kaiyang Wang, Yinhua Lv, Shuai Zhang, Yaxiao Lian, Xiaoke Liu, Zhiwei Ma, Guanjun Xiao, Qiang Liu, Shuaibo Zhai, Shengli Zhang, Gengling Liu, Ligang Yuan, Bingbing Guo, Ziming Chen, Keyu Wei, Aqiang Liu, Shizhong Yue, Guangda Niu, Xiyan Pan, Jie Sun, Yong Hua, Wu-Qiang Wu, Dawei Di, Baodan Zhao, Jianjun Tian, Zhijie Wang, Yang Yang, Liang Chu, Mingjian Yuan, Haibo Zeng, Hin-Lap Yip, Keyou Yan, Wentao Xu, Lu Zhu, Wenhua Zhang, Guichuan Xing, Feng Gao, Liming Ding (2023) Advances in the Application of Perovskite Materials NANO-MICRO LETTERS, Vol. 15, Article 177 Continue to DOI
Mengyun Chen, Tiankai Zhang, Anna Elsukova, Zhang-Jun Hu, Rui Zhang, Yonghong Wang, Xianjie Liu, Xiaoke Liu, Feng Gao (2023) Kinetically Controlled Synthesis of Quasi-Square CsPbI<sub>3</sub> Nanoplatelets with Excellent Stability Small Continue to DOI