Light-emitting diodes (LEDs)
LEDs are a type of photonic devices that convert electricity into light. They can be divided into several categories, depending on the light emitters used, for instance, inorganic LEDs, organic LEDs, quantum dot LEDs, and perovskite LEDs.
Organic light-emitting diodes (OLEDs)
At the center of my research in OLEDs is exciplex. Exciplex is an intermolecular charge-transfer excited state formed between an electron donor and an electron acceptor, normally with one of them in the S1 state. Exciplex emission is usually inefficient and is typically observed at interfaces in OLEDs. For a very long time, exciplex emission was considered undesirable in OLEDs. My research focuses on fundamental understanding of exciplex and the application of exciplex materials for highly efficient OLEDs, such as 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, Advanced Materials, Advanced Materials, etc.
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 one of the most promising semiconductors for low-cost and high-efficiency optoelectronic devices. My research on perovskites mainly includes the development of novel perovskite materials, such as three-dimensional perovskites and quasi-two-dimensional perovskites, for efficient and stable LEDs. See relevant publications in Nature Materials, Nature Communications, Advanced Materials, etc.
Carbon dot-based optoelectronics
Carbon dots are a new type of carbon-based nanomaterials. They have favorable attributes like abundance, low cost, eco-friendliness, good biocompatibility, high chemical flexibility, and appealing optical properties. My research interests on carbon dots lie in the development of highly luminescent carbon dots, especially those with thermally activated delayed fluorescence and room-temperature phosphorescence, and the applications of these materials in various electronic and photonic devices.
See full publication list at Google Scholar.