An associate professor of North Science and technology to get the important progress in the study of nanocrystalline white LED

White LED is a new generation of green solid-state lighting technology. It is very important to search for high performance white LED materials and technologies. Semiconductor nanocrystals, is a new type of luminescent material, with chemical solution preparation, easy dispersion, adjustable emission spectrum, luminous efficiency etc, to change the current LED industry of rare earth material dependence, break through the foreign patent barriers, improve the existing performance of white LED. CuInS2 nano crystal is a kind of rare earth containing heavy metals and new luminescent material, with small size, adjustable wavelength, spectrum width, self absorption of small and low cost, has obvious advantages in the application of white LED.

Zhong Haizheng, associate professor of materials for many years engaged in the synthesis of CuInS2 and CuInSe2 nanocrystals, in the research of such materials in the international advanced level. In the National Natural Science Foundation and the Ministry of science and technology 973 projects under the support of research platform of the college and school he used the material of micro and nano technology center, the optical properties of the system to study the size and composition dependent, the combination control strategy, fluorescent nanocrystals, spectral tunable absolute quantum yield of 75% in 500-700nm. On this basis, to build a pilot plant, to break the bottleneck of fluorescence nanocrystals synthesis amplification, to achieve a one-time preparation of nanocrystals BCHT magnitude, while working with a number of domestic and foreign research team, expand its application in the field of lighting, display, detection and so on. Recently, an associate professor of focus on the development of the clock sea of white LED CuInS2 series of nanocrystalline phosphor based white LED devices and high-power patch type prepared by red and green luminescent powder (see Figure 1a), the device color index >90, the maximum luminous efficiency is close to 70lm/W, color temperature is adjustable between 3000-11000K, compared with other LED technologies at home and abroad research, the color index and the luminous efficiency is in the advanced level, see Figure 1 (B). At present, he is carrying out research on nanocrystalline surface engineering, more suitable for packaging substrates, such as the use of life to break 10 thousand hours, is expected to meet the requirements of lighting and display applications, will have a broad market value.

Figure 1 (a) north Polytechnic prepared nanocrystalline phosphor preparation and its preparation of white LED devices; (b) the Northern Polytechnic made contrast preparation of nanocrystalline white LED performance of the existing technical parameters of white light illumination, the red point as the Northern Polytechnic in 2013 reported data, other data from NaturePhotonics, 2013,7,13-23 review.

The above results have been included in the Advanced Functional Materials, ACS Nano, Journal of Physical Chemistry Letters, Nanoscale Optics, Express and other high level journals published 11 SCI papers, these papers have been cited 200 times, for the core 4 patent (authorized 1), the academic report is more than 10 times in domestic and International Conference, which invited report 7 times. The preliminary research results has been recognized by domestic and foreign counterparts, in 2012 by the Journal of Physical Chemistry Letters Prashant Kamat, executive editor of Perspective professor invited to write a paper published at the same time ACS website issued a video interview, see http://pubs.acs.org/page /jpclcd/zou.html, after the publication of the journal Monthly reading became one of the 20 most papers. In just the end of the Thirteenth National Academic Conference on light, associate professor Zhong Haizheng made the "non rare earth nanocrystalline phosphor fine control and its application in LED" academic report, won the sixth prize of Xurong Xu led two outstanding young academic papers.