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Interface formation energy,bonding,energy band alignment in α-NaYF4 related core shell models:For future multi-layer core shell luminescence materials

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Journal of Rare Earths 2017年第4期35卷 315-334页

作者：黄勃龙董浩 Wong Ka-Leung 孙聆东严纯华 Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking University Department of Chemistry Hong Kong Baptist University

To break through the bottle-neck of quantum yield in upconversion （UC） core-shell system, we elucidated that the energy transfer efficiency in core-shell system had an evident contribution from the charge transfer of interface with related to two factors：（i） band offsets and （2） binding energy area density. These two variables were determined by material intrinsic properties and core-shell thickness ratio. We further unraveled the mechanism of non-radiative energy transfer by charge transfer induced dipole at the inter- face, based on a quasi-classical derivation from F6rster type resonant energy transfer （FRET） model. With stable bonding across the interface, the contributions on energy transfer in both radiative and non-radiative energy transfer should also be accounted together in Auzel＇s energy transfer （ETU） model in core-shell system. Based on the discussion about interface bonding, band offsets, and forma- tion energies, we figured out the significance of interface bonding induced gap states （IBIGS） that played a significant role for influ- encing the charge transfer and radiative type energy transfer. The interface band offsets were a key factor in dominating the non-radiative energy transfer, which was also correlated to core-shell thickness ratio. We found that the energy area density with re- lated to core/shell thickness ratio followed the trend of Boltzman sigmoidal growth function. By the physical trend, this work contrib- uted a reference how the multi-layered core-shell structure was formed starting from the very beginning within minimum size. A route was paved towards a systematic study of the interface to unveil the energy transfer mechanism in core-shell systems.

关键词： interface band-offset core-shell energy-transfer rare earths

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Electroluminescence of a Multi-Layered Organic Light-Emitting Diode Utilizing Trans-4- [p-[N-met hyl-N- （hydroxymet hyl） amino] styryl]-N-Methylphridinium Tetraphenylborate as the Active Layer

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Chinese Physics Letters 2006年第6期23卷 1607-1609页

作者：冯雪元张家雨徐春祥乔毅崔一平 Advanced Photonics Center Department of Electronic Engineering Southeast University Nanjing 210096

Employing an organic dye salt of trans-4-[p-[N-methyl-N-（hydroxymethyl）amino]styryl]-N-methylphridinium tetraphenylbovate （ASPT） as the active layer, 8-hydrocyquinoline aluminium （Alq3） as the electron transporting layer and N, N＇-diphenyl-N, N＇-bis（3-methylphenyl）-[1,1＇-biphenyl]-4,4＇-diamine （TPD） as the hole transporting layer, respectively, we fabricate a multi-layered organic light-emitting diode and observe the colour tunable electroluminescence （EL）. The dependence of the EL spectra on the applied voltage is investigated in detail, and the recombination mechanism is discussed by considering the variation of the hole-electron recombination region.

关键词： energy-transfer CONJUGATED POLYMERS DEVICES EMISSION COLOR WHITE SALT BLUE

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Near Infrared Broadband Emission from Bismuth-Dysprosium Codoped Chalcohalide Glasses

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Chinese Physics Letters 2007年第7期24卷 1958-1960页

作者：任晶陈丹平杨光许银生曾惠丹陈国荣 Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

We investigate the broadband infrared emission of bismuth doped and bismuth/dysprosium codoped chalcohalide glasses. It is found that the bismuth/dysprosium codoping can drastically enhance the f/uorescence as compared with either bismuth or dysprosium doped glasses. Meanwhile, the full width at half maximum of bismuth/dysprosium codoped glasses is over 170 nm, which is the largest value among all the reported rare-earth doped chalcohalide g/asses. An ideal way for energy consumption between bismuth and dysprosium ions is supposed. Such improved gain spectra of both bismuth and dysprosium ions may have potential applications in developing broadband fibre amplifiers.

关键词： OPTICAL AMPLIFICATION energy-transfer LUMINESCENCE STATES

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Fast Optical Switching Using Oriented Cyanine Dye-Doped Nematic Liquid Crystal

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Chinese Physics Letters 2006年第10期23卷 2786-2789页

作者：金朝辉李忠玉 KASATANI Kazuo OKAMOTO Hiroaki Department of Advanced Materials Science and Engineering Faculty of Engineering Yamaguchi University Tokiwadai Ube 755-8611 Japan

A cyanine dye, 2-[7-（1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene）-1,3,5-heptatrienyl]-1,3,3-trimethyl-3H-indolium iodide （NK-125）, is doped in 4-cyano-4＇-pentylbiphenyl （5 CB）, and the mixture is sandwiched between two pieces of rubbed glass plates. The third-order nonlinear optical properties of the oriented NK-125-SCB layers are measured by the resonant femtosecond degenerate four-wave mixing （DFWM） technique at 760 nm. The third-order nonlinear optical susceptibility of one of the present samples is 5.5×10^-8 esu. The slow DFWM response of the NK-125-SCB layers due to a population grating is accelerated by the increasing laser power because of amplified spontaneous emission （ASE）. On the other hand, we do not observe a similar phenomenon for NK-125- polyethylene glycol （PEG-400）. Oriented NK-125 molecules in nematic liquid crystals must have very high ASE efficiency. Hence the population grating in a DFWM signal disappears within about 4 ps. It is expected that NK-125-SCB can be used as a material for very fast all-optical switching.

关键词： RELAXATION DYNAMICS energy-transfer SQUARYLIUM DYE COATING FILMS POLYMER-FILMS FAST-RESPONSE NONLINEARITIES STATE SUSCEPTIBILITY SPECTROSCOPY

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Concentration Quenching in Erbium Doped Bismuth Silicate Glasses

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Chinese Physics Letters 2006年第7期23卷 1923-1925页

作者：戴世勋徐铁峰聂秋华沈祥王训四 College of Information Science and Engineering Ningbo University Ningbo 315211

Er2O3-doped bismuth silicate glasses are prepared by the conventional melt-quenching method, and the Er^3＋：^4 I13/2 → ^4I15/2 fluorescence properties are studied for different Er^3＋ concentrations. Infrared spectra are measured to estimate the exact content of OH- groups in the samples. Based on the electric dipole-dipole interaction theory, the interaction parameter CEr,Er for the migration rate of Er^3＋：^4 I13/2 → ^4I13/2 in proposed glasses is calculated.

关键词： SPECTROSCOPIC PROPERTIES TELLURITE GLASSES energy-transfer AMPLIFIER IONS

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Near Infrared Photoluminescence from Yb,Al Co-implanted SiO2 Films on Silicon

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Chinese Physics Letters 2006年第8期23卷 2183-2186页

作者：张建国王晓欣成步文余金中王启明 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences

Intense room-temperature near infrared （NIR） photoluminescence （980 nm and 1032 nm） is observed from Yb,Al co-implanted SiO2 films on silicon. The optical transitions occur between the ^2F5/2 and ^2F7/2 levels of Yb^3＋ in SiO2. The additional Al-implantation into SiO2 films can effectively improve the concentration quenching effect of Yb^3＋ in SiO2. Photoluminescence excitation spectroscopy shows that the NIR photoluminescence is due to the non-radiative energy transfer from Al-implantation-induced non-bridging oxygen hole defects in SiO2 to Yb^3＋ in the Yb-related luminescent complexes. It is believed that the defect-mediated luminescence of rare-earth ions in SiO2 is very effective.

关键词： SI-NANOCRYSTALS MU-M energy-transfer RICH SIO2 LUMINESCENCE EXCITATION EMISSION IONS FLUORESCENCE WAVELENGTH

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Influence of Dopant Concentration on Electroluminescent Performance of Organic White-Light-Emitting Device with Double-Emissive-Layered Structure

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Chinese Physics Letters 2008年第1期25卷 294-297页

作者：吴晓明华玉林印寿根张丽娟王宇侯庆传张均媚 Institute of Material Physics Tianjin University of Technology Tianjin 300384 Key Laboratory of Display Materials and Photoelectric Devices (Ministry of Education) Tianjin University of Technology Tianjin 300191 Tianjin Key Laboratory of Photoelectric Materials and Device Tianjin 300384 Station 58 Tianjin Supervision Bureau of Quality and Technology Tianjin 300381

A novel phosphorescent organic white-light-emitting device （WOLED） with contiguration of ITO/NPB/CBP： TBPe：rubrene/Zn（BTZ）2：Ir（piq）2（acac）/Zn（BTZ）2/Mg：Ag is fabricated successfully, where the phosphorescent dye bis （1-（phenyl）isoquinoline） iridium （Ⅲ） acetylanetonate （Ir（piq）2 （acac）） doped into bis-（2-（2-hydroxyphenyl） benzothiazole）zinc （Zn（BTZ）2）（greenish-blue emitting material with electron transport character） as the red emitting layer, and fluorescent dye 2,5,8,11-tetra-tertbutylperylene （TBPe） and 5,6,11,12-tetraphenyl-naphthacene （rubrene） together doped into 4,4＇-N,N＇-dicarbazole-biphenyl （CBP）（ambipolar conductivity material） as the blue-orange emitting layer, respectively. The two emitting layers are sandwiched between the hole-transport layer N ,N＇-biphenyl-N , N＇-bis （1-naph thyl）-（1,1＇-biphenyl）-4, 4 Cdiamine （NP B） and electron-transport layer （Zn（BTZ）2 ） The optimum device turns on at the driving voltage of 4.5 V. A maximum external quantum efficiency of 1.53%. and brightness 15000 cd/m^2 are presented. The best point of the Commission Internationale de 1＇Eclairage （CIE） coordinates locates at （0.335, 0.338） at about 13 V. Moreover, we also discuss how to achieve the bright pure white light through optimizing the doping concentration of each dye from the viewpoint of energy transfer process.

关键词： energy-transfer DIODES

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Enhanced Electroluminescent Efficiency Based on Functionalized Europium Complexes in Polymer Light-Emitting Diodes

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Chinese Physics Letters 2007年第5期24卷 1376-1379页

作者：张勇王磊李春曾文进史华红曹镛 Institute of Polymer Optoelectronlc Materials and Devices Key Laboratory of Special Functional Materials (Ministry of Education) South China University of Technology Guangzhou 510640

Efficient red polymer light-emitting diodes are fabricated with the single active layer from the blends of poly（N- vinylcarbazole）（PVK） in the presence of 30 wt. % electron-transporting compound 2-（4-biphenylyl）-5-（ptert- butylphenyl）-1,3,4-oxadiazole （PBD） and europium complexes. The polyphenylene functionalized europium com- plex shows an enhanced electroluminescent efficiency due to the large site-isolation effect. For the polyphenylene functionalized europium complex, the maximum external quantum efficiency of 1.90% and luminous efficiency of 2.01 cd A^-1 are achieved with emission peak at 612nm. The maximum brightness is more than 300cd m^-2.

关键词： energy-transfer DEVICES

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Miscibility and Molecular Orientation of Carbazole in Mixed Langmuir and Langmuir-Blodgett Films

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Chinese Physics Letters 2007年第7期24卷 2044-2047页

作者： Md. N. Islam D. Bhattachaxjee S. A. Hussain Department of Physics Tripura University Suryamaninagar-799130 Tripura India

We report the miscibility and molecular orientation of carbazole （CA） molecules in the mixed Langmuir and Langmuir-Blodgett （LB） films of CA in polymethyl methacrylate （PMMA） and stearic acid （SA） matrices. The lr-A isotherm confirms the formation of stable Langmuir films of CA mixed with either PMMA or SA at airwater interface. ＇Characteristics of area per molecule versus molefraction and collapse pressure versus molefraction reveal complete demixing of CA and the matrix PMMA/SA molecules in the mixed films. Absorption spectroscopy certainly confirms the fact that CA molecules have preferred orientation on the substrate of the LB films.

关键词： ELECTROLUMINESCENT DEVICES energy-transfer

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Improved Fluorescence from Tm^3＋/Er^3＋/Ce^3＋ Triply Doped Bismuth-Silicate Glasses for S＋C-bands Amplifiers

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Chinese Physics Letters 2006年第9期23卷 2553-2556页

作者：王训四聂秋华刘立人徐铁锋沈祥戴世勋章向华 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 Faculty of Information Science and Engineering Ningbo University Zhejiang 315211 Institut de Chimie de Rennes Universite de Rennes Rennes Cedex 135042 France

Fluorescence of Tm^3＋/Er^3＋ codoped bismuth-silica （BS） glasses and the sensitization of Ce^3＋ are investigated, It shows that Ce^3＋ codoping with Tm^3＋/Er^3＋ in BS glasses results in a quenching of Tm^3＋ ion emission from ^3F4 to the ^3H6 level. Consequently, the 1.47μm emission occurs after the population inversion between the ^3H4 and ^3F4 levels. Furthermore, the codoped glasses show the broad emission spectra over the whole S and C bands with full-width at half-maximum （FWHM） up to about 119nm, as it combines 1.55μm emission band of Er^3＋ with 1.47μm emission band of Tm^3＋ under 800hm excitation.

关键词： SPONTANEOUS EMISSION TELLURITE GLASSES energy-transfer FLUORIDE GLASS FIBER ER3+ IONS SPECTROSCOPY TM3+ CE3+

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