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Multifunctional Dy(Ⅲ)doped di-calcium silicate array for boosting display and forensic applications

Journal of Rare Earths 2018年第7期36卷 690-702页

作者： M.Venkataravanappa R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma P.Hema Prabha S.Ramani H.Nagabhushana Department of Physics Govt.First Grade CollegeSiraTumkur 572 137India Research and Development Center Bharathiar UniversityCoimbatore 641 046India Prof.CN.R.Rao Centre for Advanced Materials Research Tumkur UniversityTumkur 572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore 560 107India Department of Physics BMS Institute of Technology and ManagementVTU-afflliatedBangalore 560 064India Department of Mechanical Engineering Jain UniversityJain Group of InstitutionsBangalore 560 069India Avinashilingam Institute for Home Science and Higher Education for Women University Coimbatore 6410 43India Department of Food Processing and Preservation Technology Avinashilingam Institute for Home Science and Higher Education for Women UniversityCoimbatore 641043India

Latent fingerprints（LFPs） are the major physical evidences for the identification of individuals during crime spot investigation. Till date, numerous methods were followed to visualize LFPs. However, simple,accurate, and cost-effective method has wide scope in advanced forensic field. In our work, Ca2 SiO4：Dy^（3＋）nanopowders（NPs） were fabricated via solution combustion route. The optimized sample was employed for the visualization of overlapped LFPs by the cost effective powder dusting method. The obtained results reveals the complete three levels of ridge characteristics with high sensitivity, reproducibility,selectivity, and reliability on various complex surfaces. The photoluminescence（PL） spectra consist of intense peaks at ～ 480 and 574 nm owing to ~4 F（9/2） →~6 H（15/2） and ~4 F（9/2）→~6 H（13/2） 4 f transitions of Dy3＋ ions,respectively. The photometric properties confirm that the samples exhibit intense white emission with high color purity. Therefore, the prepared NPs could be a definitive choice as an advanced luminescent NPs for forensic, solid state lighting and portable FED devices.

关键词： Solution combustion Photoluminescence solid state lighting Fingerprint patterns Sweat pores Rare earths

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Luminescence enhancement of BaMgSiO_4:Eu^(2+) by adding borate as flux

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Journal of Rare Earths 2008年第1期26卷 26-30页

作者：乌凤岐王稼国荆西平严纯华林建华廖复辉 Beijing National Laboratory for Molecular Sciences the State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University

The luminescence of EU^2＋ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from different Eu^2＋ sites in the lattice. When the BaB2O4 flux was applied, the intensity of the 398 nm emission was not clearly affected, but the intensity of the 515 nm emission was enhanced by about ten times. Gaussian fitting showed that the emission band at around 515 nm could actually be resolved into two bands with peak wavelengths of 499 nm and 521 nm, respectively. The assignments of the emission bands to the cation sites were carried out according to the values of bond valence. The overlapping of the 398 nm emission band on the excitation band of 515 nm emission implied that energy transfer could occur from the luminescent center related to the 398 nm emission to the center related to the 515 nm emission, and the energy transfer process remarkably enhanced the intensity of the 515 nm emission band. The phosphor had strong excitation at around 350-400 nm and emitted a bright green luminescence. Thus it could have applications as a green component in solid-state lighting devices assembled by near-UV Light Emitting Diodes （LED） combined with tricolor phosphors.

关键词： BaMgSiO4:Eu^2+ luminescence energy transfer flux solid state lighting rare earths

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Combustion synthesis of Ce^(3+), Eu^(3+) and Dy^(3+) activated NaCaPO_4 phosphors

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Journal of Rare Earths 2011年第6期29卷 527-535页

作者： K N Shinde S J Dhoble Animesh Kumar Department of Physics RTM Nagpur University National Environmental Engineering Research Institute

The preparation of NaCaPO4 doped with rare earth （RE） ions Ce3＋, Eu3＋ and Dy3＋ by combustion method was described. Under UV excitation （251 nm） of NaCaPO4：Ce3＋ showsd emission （367 nm） in UV range. When NaCaPO4：Dy3＋ phosphor was excited at 349 nm, the emission spectrum showed intense bands at 482 nm （blue） and 576 nm （yellow）. In Eu activated NaCaPO4 phosphor, the emission spectrum showed a dominant peak at 594 nm （orange） while others were at 614 and 621 nm （red） when excited at 393 nm. The prepared phosphor was characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and photoluminescence （PL） measurement. Thus, the photoluminescence behavior of NaCaPO4：Ce3＋ was strongly suggested for scintillator. Likewise, Eu3＋ and Dy3＋ activated NaCaPO4 phosphors were recommended for near-UV white light-emitting diodes （LEDs）.

关键词： combustion synthesis photoluminescence phosphor scintillator solid state lighting rare earths

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LED lighting Development in Taiwan

LED Lighting Development in Taiwan

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海峡两岸第十届照明科技与营销研讨会

作者： Yung S.Liu Jung-Tsung Hsu Jim Chi Nano-Photonics Center Opto-Electronics ＆ Systems Laboratories （OES） Industrial Technology Research Institute （ITRI） Nano-Photonics Center Opto-Electronics ＆ Systems Laboratories （OES） Industrial Technology Research Institute （ITRI） Nano-Photonics Center Opto-Electronics ＆ Systems Laboratories （OES） Industrial Technology Research Institute （ITRI）

＜正＞ This paper reviews the current status of the solid state lighting technology development at the Opto-Electronics ＆ Systems Labs. （OES）, Industrial Technology Research Institute （ITRI） and discusses recent ... 详细信息

关键词： Optoelectronics GaN solid state lighting LED compound semiconductor optoelectronics industry

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LED in Double function;Light Source and Light Sensor

LED in Double function;Light Source and Light Sensor

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第八届中国国际半导体照明论坛（大会/技术分会）

作者： S.Tarashioon C.Guo H.van Zeijl W.D.van Driel G.Q Zhang Materials innovation institute(M2i) Dimes Center for SSL Technologies Micro/Nanoelectronics System Integration and Reliability Delft University of Technology

In this paper we demonstrate the workability of LED as light sensor besides being a light source in a（SSL） solid state lighting system. The LED in forward bias operates as a light sensor and in the reverse bias works as a light sensor. The results presented in this paper show the reproducibility and sensitivity of this light sensor.

关键词： Light Emitting Diode Light Sensor solid state lighting sensor sensitivity Reliability

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