清華大學(xué)

研究概況以GaN基LED為核心的半導(dǎo)體照明技術(shù)，在我國已形成年產(chǎn)值數(shù)千億元戰(zhàn)略性新興產(chǎn)業(yè)。本課題組針對LED光源的特點(diǎn)，在國內(nèi)率先開展基于非成像光學(xué)的三維自由曲面照明光學(xué)系統(tǒng)設(shè)計(jì)研究，原創(chuàng)了采用三維自由光學(xué)曲面高效、均勻調(diào)控LED光線到被照明區(qū)域的系列技術(shù)，突破了制約半導(dǎo)體照明實(shí)際應(yīng)用的瓶頸。相關(guān)研究成果已經(jīng)實(shí)現(xiàn)產(chǎn)業(yè)化，產(chǎn)品廣泛應(yīng)用于國內(nèi)27個(gè)省市的眾多照明工程中，并出口至美國、日本等國家，展示了較傳統(tǒng)照明和同類產(chǎn)品優(yōu)異的照明和節(jié)能效果。相關(guān)研究獲得2010年廣東省科學(xué)技術(shù)一等獎、2014年國家技術(shù)發(fā)明二等獎。

目前的研究興趣包括，半導(dǎo)體照明和顯示技術(shù)；新型光信息處理、成像、探測、三維顯示器件和系統(tǒng)，柔性光電子器件，生物光學(xué)/光子學(xué)器件和系統(tǒng)等。

本人先后承擔(dān)國家自然科學(xué)基金青年基金、國家自然科學(xué)基金國際合作基金、國家“863”計(jì)劃子課題、國家科技支撐計(jì)劃子課題、國家實(shí)驗(yàn)室開放基金、國家重點(diǎn)實(shí)驗(yàn)室開放基金、部委專項(xiàng)等項(xiàng)目。

獎勵與榮譽(yù)2014年國家技術(shù)發(fā)明二等獎（排名第5）。

學(xué)術(shù)成果迄今為止發(fā)表SCI論文40余篇，主要代表性論文：

[1]. 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).
[2]. 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).
[3]. 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).
[4]. 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).
[5]. 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).
[6]. 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).
[7]. 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).
[8]. Wang Kun, Han Yanjun, Li Hongtao, Luo Yi, “Overlapping-based optical freeform surface construction for extended lighting source,” OPTICS EXPRESS 21, 19750-19761(2013).
[9]. 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).
[10]. 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).
[11]. 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).
[12]. Li Hongtao, Luo Yi, et al., “Thickness measurement of GaN films by X-ray diffraction,” ACTA PHYSICA SINICA 57(11), 7119-7125 (2008).