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Study of white light emission from ZnS/PS composite system

Chinese Optics Letters 2007年第9期5卷 546-548页

作者：王彩凤李清山吕磊张立春齐红霞 College of Physics and Engineering Qufu Normal University

ZnS films were deposited by pulsed laser deposition （PLD） on porous silicon （PS） substrates formed by electrochemical anodization of p-type （100） silicon wafer. The photoluminescence （PL） spectra of ZnS/PS composites were measured at room temperature. Under different excitation wavelengths, the relative integrated intensities of the red light emission from PS layers and the blue-green emission from ZnS films had different values. After samples were annealed in vacuum at different temperatures （200, 300, and 400 ~C） for 30 min respectively, a new green emission located at around 550 nm appeared in the PL spectra of all ZnS/PS samples, and all of the ZnS/PS composites had a broad PL band （450 - 700 nm） in the visible region, exhibiting intensively white light emission.

关键词： Light emission photoexcitation Photoluminescence Porous silicon Pulsed laser deposition Silicon wafers Thin films

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Study of Inner-Shell Excitation and Relaxation Processes in Atomic and Ionic Neon by Means of Soft X-Ray Spectroscopy

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Plasma Science and Technology 2010年第3期12卷 353-360页

作者： M.OURA RIKEN SPring-8 Center 1-1-1 KoutoSayo-choSayo-gun

By using soft X-ray spectroscopy, we investigate the inner-shell excitation and relaxation processes in atomic and ionic neon targets. Resonant X-ray emission spectroscopy was applied to neutral neon atom in the regions of the [1s]np （n = 3, 4,…, ε） excited states and [1s2p]3pmp （m = 3,4） doubly excited states to obtain the spectroscopic information on the [2p]np and [2p^2]3prnp final electronic states, where square brackets indicate hole states. The energy levels of the [2p^2]3prnp （m = 3,4） electronic states were spectroscopically measured for the first time. As for the ionic neon target, on the other hand, the photoion yield spectroscopy was adopted to survey the 1s→ np （n = 2, 3） resonant excitation and subsequent Auger decay processes for Ne^＋ target-ions. The observed Ne^2＋ photoion yield spectrum is successflllly explained by the theoretical calculations based on the nmlticonfiguration Dirac-Fock method

关键词： neon photoexcitation soft X-ray emission spectroscopy merged-beam method multi-configuration Dirac-Fock (MCDF) calculation

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Direct observation of the ultrafast energy transfer in a porphyrin and ruthenium dyad

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Chinese Optics Letters 2009年第7期7卷 646-649页

作者：沈涵王惠刘杰沈勇黄锦汪计亮年 State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of Chemistry and Chemical Engineering Sun Yat-Sen University

The luminescence dynamics of a polypyridyl ruthenium II [Ru（phen）2（ip）]2＋ and 5,10,15,20- tetraphenylporphyrin （H2TPP） dyad have been measured by using time-resolved fluorescence spectroscopy. The transient luminescent spectra of the dyad show an ultrafast energy transfer within 300 ps after pho- toexcitation of the [Ru（phen）2（ip）]2＋ at 453 am. However, no energy transfer has been observed as the excitation wavelength is 400 nm, corresponding to the absorption peak of H2TPP. The origin of the energy transfer from [Ru（phen）2（ip）]2＋ to H2TPP has been analyzed according to the FSrster energy-transfer theory.

关键词： Fluorescence spectroscopy Luminescence photoexcitation Porphyrins Ruthenium

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