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Structure, Chemical State and Luminescent Properties of Ce,Gd：YAG Transparent Ceramic for Flip-chip White LED Application

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Chinese Journal of Structural Chemistry 2018年第6期37卷 948-954页

作者：邓种华陈剑刘光张卫峰黄集权黄秋凤郭旺曹永革 Key Laboratory of Optoelectronic Materials Chemical and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Department of Physics School of Science Renmin University of China

Ce,Gd：YAG transparent ceramic was prepared by tape casting and solid state reaction method. Meanwhile, its crystal structure, chemical state and luminous properties were discussed. The prepared samples are identified as pure garnet structure by the XRD results. The valence states of tetravalent and trivalent Ce ions were identified distinctly by X-ray photoelectron spectroscopy. A strong broad band yellow emission was found in photoluminescence（PL） spectra. The quantum yield reached 90.2% at room temperature. When collaborated with a 1.0 mm × 1.0 mm flip-chip, a luminous efficiency（LE） as high as 116.5 lm/W with a correlated color temperature（CCT） of 6627 K at a power dissipation of 1.13 W at 350 m A was demonstrated, indicating that Ce,Gd：YAG transparent ceramics had a promising potential for high power white light-emitting diodes.

关键词： Ce,Gd:YAG crystal structure trivalent fluorescence and luminescence

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Progress on mid-IR graphene photonics and biochemical applications

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Frontiers of Optoelectronics 2016年第2期9卷 259-269页

作者： Zhenzhou CHENG Changyuan QIN Fengqiu WANG Hao HE Keisuke GODA Department of Chemistry University of Tokyo Tokyo 113-0033 Japan School of Electronic Science and Engineering Nanjing University Nanjing 210023 China Med-X Research Institute School of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200031 China Department of Electrical Engineering University of California Los Angeles 90095 USA Japan Science and Technology Agency Tokyo 102-0076 Japan

Mid-infrared （mid-IR）（2-20 μm） photonics has numerous chemical and biologic ＂fingerprint＂ sensing applications due to characteristic vibrational transitions of molecules in the mid-IR spectral region. Unfortunately, compared to visible light and telecommunication band wavelengths, photonic devices and applications have been difficult to develop at mid-IR wavelengths because of the intrinsic limitation of conventional materials. Breaking a new ground in the mid-IR science and technology calls for revolutionary materials. Graphene, a single atom layer of carbon arranged in a honey-comb lattice, has various promising optical and electrical properties because of its linear dispersion band structure and zero band gap features. In this review article, we discuss recent research develop- ments on mid-IR graphene photonics, in particular ultrafast lasers and photodetectors. Graphene-photonics-based biochemical applications, such as plasmonic sensing, photo- dynamic therapy, and florescence imaging are also reviewed.

关键词： mid-infrared (mid-IR) graphene lasers,photodetectors optical sensing and sensors photodynamictherapy spectroscopy fluorescence and luminescence

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Spectral analysis of short-wavelength emission by up-conversion in a Tm3+:ZBLAN dual-diode-pumped optical fiber

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Chinese Optics Letters 2020年第7期18卷 77-81页

作者： M.Juárez-Hernández E.B.Mejía Centro de Investigaciones enÓptica A.C.37150 GuanajuatoMéxico División de Ciencias e Ingenierías Universidad de Guanajuato37150 GuanajuatoMéxico

The fluorescence evolution along Tm3+-doped Zr F4–Ba F2–La F3–Al F3–Na F(ZBLAN) optical fibers, as well as amplified spontaneous emission in the UV-IR region with emphasis on 350 nm, 365 nm, and 450 nm, is studied,estimating optimal fiber lengths for amplification within the region. The fibers were diode-pumped with single and double lines(687 and/or 645 nm). Double-line pumping presents a quite superior efficiency for producing UV-blue signals with the benefit of requiring very short fibers, around 20 cm, compared to single-line pumping requiring more than 50 cm. A virtual cycle in which the pumps enhance each other’s absorption is the key to these systems.

关键词： nonlinear optics fiber up-conversion fluorescence and luminescence

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