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White LED represents a new generation of green, solid-state lighting technology, and the development of high-performance white LED materials is of great significance. Semiconductor nanocrystals are emerging as a promising class of luminescent materials, offering advantages such as solution-processability, tunable emission spectra, high luminous efficiency, and easy dispersion. These properties make them a strong candidate to reduce reliance on rare earth materials, overcome foreign patent barriers, and enhance existing LED technologies. Among these, CuInSâ‚‚ nanocrystals stand out as a rare-earth-free and heavy-metal-free material with small size, adjustable wavelength, wide emission spectrum, low self-absorption, and cost-effectiveness, making them highly suitable for white LED applications.
Associate Professor Zhong Haizheng from the School of Materials has dedicated years to the synthesis of CuInS₂ and CuInSe₂ nanocrystals, achieving international recognition in this field. Supported by the National Natural Science Foundation of China and the Ministry of Science and Technology 973 Program, he utilized the School of Materials Science and Micronano Technology Center's research platform to systematically investigate the optical properties of these nanocrystals. By employing a combination of control strategies, he successfully developed fluorescent nanocrystals with an adjustable emission spectrum between 500–700 nm and an absolute quantum yield of up to 75%.
To address the challenges in large-scale synthesis, a small-scale test device was established, enabling the preparation of nanocrystals at the one-hundred-gram level. In addition, collaborations with multiple domestic and international research groups have expanded the application of these materials in areas such as display, sensing, and detection.
Recently, Professor Zhong focused on developing white LEDs based on CuInSâ‚‚ nanocrystal phosphors. Using red and green nanocrystal phosphors, he fabricated white LED devices with a color rendering index (CRI) greater than 90, a maximum luminous efficacy of nearly 70 lm/W, and an adjustable color temperature ranging from 3000K to 11000K. Compared to other LED technologies, the CRI and luminous efficiency of these devices are among the best globally.
Currently, his research is focused on surface interface engineering of nanocrystals to find more suitable packaging substrates. If the service life can exceed 10,000 hours, these materials are expected to meet the requirements for lighting and display applications, offering significant market potential.
The research has been published in top-tier journals such as Advanced Functional Materials, ACS Nano, Journal of Physical Chemistry Letters, Nanoscale, and Optics Express, with over 200 citations and four core patents filed (one granted). The work has also been presented more than 10 times at national and international conferences, including seven invited talks.
The results have gained recognition from both domestic and international peers. In 2012, Professor Prashant Kamat, editor-in-chief of the Journal of Physical Chemistry Letters, invited a Perspective essay. The ACS website also featured a video interview with Professor Zhong, available at http://pubs.acs.org/page/jpclcd/zou.html. After publication, the paper became one of the most-read papers of that month. At the 13th National Conference on Luminescence Science, Professor Zhong delivered a talk titled “Non-Rare-Earth Nanocrystal Phosphor Fine Control and Its LED Application,†and received the 6th Xu Zuoyi Excellent Luminescence Academic Paper Award.