. Luo Yi, Bai Yiming, Han Yanjun Han, Li Hongtao Li, et. al, “Light extraction efficiency enhancement of GaN-based blue LEDs based on ITO/ InxO ohmic contacts with microstructure formed by annealing in oxygen,” OPTICS EXPRESS 24, A797-A809 (2016).
. Mao Xianglong, Li Hongtao*, Han Yanjun, Luo Yi, “Polar-grids based source-target mapping construction method for designing freeform illumination system for a lighting target with arbitrary shape,” OPTICS EXPRESS 23, 4313-4328(2015).
. Mao Xianglong, Li Hongtao*, Han Yanjun, Luo Yi, “Two-step design method for highly compact three-dimensional freeform optical system for LED surface light source,” OPTICS EXPRESS 22, A1491-A1506(2014).
. Mao Xianglong, Li Hongtao*, Han Yanjun, Luo Yi, “A two-step design method for high compact rotationally symmetric optical system for LED surface light source,” OPTICS EXPRESS 22, A233-A247(2014).
. Xu Bin, Li Hongtao*, Mao Xianglong, Han Yanjun, Luo Yi, “A Design Method of Freeform Optical Surface Using the Mapping Obtained from Supporting Ellipsoids Algorithm[C],” Asia Communications and Photonics Conference. Optical Society of America ATh1J.2(2014).
. Li Hongtao*, Mao Xianglong, Han Yanjun, Luo Yi, “Wavelength Dependence of Colorimetric Properties of Lighting Sources Based on Multi-Color LEDs,” OPTICS EXPRESS 21, 3775-3783(2013).
. Li Hongtao*, Chen Shichao, Han Yanjun, Luo Yi, “A Fast Feedback Method to Design Easy-Molding Freeform Optical System with Uniform Illuminance and High Light Control Efficiency,” OPTICS EXPRESS 21, 1258-1269(2013).
. Wang Kun, Han Yanjun, Li Hongtao, Luo Yi, “Overlapping-based optical freeform surface construction for extended lighting source,” OPTICS EXPRESS 21, 19750-19761(2013).
. Situ Wenchang, Han Yanjun, Li Hongtao and Luo Yi, “Combined feedback method for designing a free-form optical system with complicated illumination patterns for an extended LED source," OPTICS EXPRESS 19 (105), A1022-A1030 (2011).
. Luo Yi, Feng Zexin, Han Yanjun and Li Hongtao, “Design of compact and smooth free-form optical system with uniform illuminance for LED source,” OPTICS EXPRESS 18(9), 9055-9063 (2010).
. Li Hongtao, Luo Yi, et al., “Determination of the twist angle of GaN film by high resolution X-ray diffraction,” Applied physics express 1(4), 045004 (2008).
. Li Hongtao, Luo Yi, et al., “Thickness measurement of GaN films by X-ray diffraction,” ACTA PHYSICA SINICA 57(11), 7119-7125 (2008).