Mn thin film phosphors for high intensity miniature electroluminescent displays g. This specification describes phosphor compositions used in fluorescent layers for scanning beam displays. Solution combustion derived nanocrystalline zn sio. Thomas nottingham trent university abstract this paper details an investigation into the deposition by rf magnetron sputtering of.
Jambagi materials research laboratory, department of physics shivaji university, kolhapur, 416004, india and a. Vuv phosphors for pds and excimer lampsjuestel 201101. The long persistent luminescence properties of phosphors. Zn rich ceramic targets were prepared to compensate for loss of vaporization of zn. Metaltometal charge transfer in awo4 a mg, mn, co, ni. The influences of manganese concentration and heat treatment conditions on the crystallization and photoluminescence of the phosphors were investigated.
Sunlightactivated longpersistent luminescence in the. Mn phosphors was obviously improved when the mass ratio of sno2. Sirichai leelachao, shinji muraishi, takumi sannomiya, ji shi, and yoshio namamura, mechanoluminescence of zns. Zn concentration affects the phosphor crystallinity, morphology, composition and. Mn phosphors remained the same as the asprepared phosphors. Phosphor thermometry is a temperature measurement approach that uses the temperature dependence of certain phosphors. Article views are the countercompliant sum of full text article downloads since november 2008 both pdf and html across all institutions and individuals. Process optimization time, temperature, atmosphere. Full text views reflects the number of pdf downloads, pdfs sent to. Mn phosphor are not disturbed at all up to about 60 mol % of znse, although they are masked one after another with long tail of. Zno coated nanoparticle phosphors volume 94 masakazu kobayashi. Zn concentration affects the phosphor crystallinity, morphology, composition and energy structure.
Photoluminescent studies in cosputtered znga o films. Mn appeared clearly higher than the intensity of zns. The effect the activator concentration, the precipitation medium, and the annealing temperature have on the surface properties of zn 3 po 4 2. Mn thin film phosphors for high intensity miniature electroluminescent displays. A screen method was employed to print the asfabricated phosphors on the indium tin oxide itoz. The antisite defects are known to act as electron traps and to affect the. Luminescence studies of zns 1x mnte x nanophosphors prepared by wet chemical method written by dr deepti pateria, dr prabhakar pateria published on 20180424 download full article with reference data and citations. The findings in this report are not to be construed as an official department of the army position unless so.
The phosphor is not suitable to be used in layers thicker than 25 mgcm. Mn phosphors and its correlation to impact energy and contact geometry. They appear in yag when some y and al atoms exchange positions. For this, a phosphor coating is applied to a surface of interest and, usually, the decay time is the emission parameter that indicates temperature. Inorganic phosphor materials for lighting springerlink. The effects of zinc on the phosphors have been investigated by varying the stoichiometric proportions of raw materials. Using a combination of uvvisible spectroscopy and electronic structure calculations, we have characterized the electronic structures and optical properties of awo4 a mn, co, ni, cu, zn, or mg tungstates with the wolframite structure.
Znga 2 o 4 and zn 1x mn x ga 2 o 4 were investigated as potential low voltage. Nanosized manganesedoped zinc aluminate spinel zn1. Mn halo 5000 k halo 6500 k halo 4100 k halo 3400 k halo 2900 k halo blue bam green cie 1931 chromaticities of gas discharge lighting phosphors cbtm yve yag sae mgm spe zsm bbg yox lap cat cbt bam y sps x. Synthesis and characterization of highquality zns, zns. Mn phosphor for use in medical imaging radiation detectors. To discover new narrowband greenemitting phosphors is a challenge for backlighting lightemitting diodes leds used in liquid crystal displays lcds. Optical properties of zno phosphors activated with mn and. Doped quantum dots for whitelight emitting diodes without reabsorption of multiphase phosphors. Solution combustion derived nanocrystalline zn2sio4.
The density of traps with suitable depth was significantly. Us9546319b2 us14401,368 us20144068a us9546319b2 us 9546319 b2 us9546319 b2 us 9546319b2 us 20144068 a us20144068 a us 20144068a us 9546319 b2 us9546319 b2 us 9546319b2 authority us united states prior art keywords eu group consisting selected sr phosphor prior art date 20120522 legal status the legal status is an assumption and is not a legal conclusion. Allinone lighttunable borated phosphors with chemical and luminescence dynamical control resolution. Mndoped zn 2 sio 4 phosphors synthesis using flame spray. Mn phosphors and its correlation to impact energy and contact geometry, opt. In mgwo4 and znwo4, the lowest energy optical excitation is a ligand to metal charge transfer lmct excitation from oxygen 2p nonbonding orbitals to. Mn phosphor was evaluated for use in radiation detectors of medical imaging systems. Mndoped zn2sio4 were synthesized from sls waste glass, zno and mno using conventional solidstate method.
Mn p1 degrades by desorption of oxygen under electron bombardment. Visiblelight persistent phosphors are being widely used as selfsustained nightvision materials because of their sufficiently strong and long afterglow 10 h and their ability to be excited by. Mn was used in the form of laboratoryprepared fluorescent layers screens with coating weights from 18 to 150 mgcm 2. In general, one aspect of the subject matter described in this specification can be embodied in a display device having a fluorescent layer that absorbs an excitation light at a single wavelength and emits visible light. The firing was done at 780 20 c for 1 h in nitrogen gas atmosphere of silica tubular furnace. Using various optimization procedures, we have produced znse. Zno coated nanoparticle phosphors mrs online proceedings. Zinc chloride, aluminum isopropoxide, and manganese chloride were employed as precursors. The phosphor was excited to luminescence by lowenergy xraysusing xraytube voltages ranging from 15 to 50 kvp. Zn rich ceramic targets have been prepared to compensate the.
Sreekanth chakradhara department of physics, indian institute of science, bangalore560 012, india b. The interrelation between the intensity of xray excited luminescence and the relative surface content of certain absorption sites is established. Pdf development of nanophosphors for light emitting diodes. Solution combustion derived nanocrystalline zn 2 sio 4. The structural characterization was carried out on a series of znga 2 o 4. Mn doped bzs absorbs ultra violet light and emits red light peaking at around 640nm. Journal of alloys and compounds 421 2006 268272 photoluminescent properties of ba 2zns 3. The blue emitting long persistent phosphor lpp li 2 zngeo 4 and green emitting lpp li 2 zngeo 4. Mn phosphors with hydrothermal methods, journal of luminescence on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Files available from the acs website may be downloaded for personal use only. The synthesis and optical properties of cs3mnbr5 are demonstrated herein. Development of nanophosphors for light emitting diodes osa.
A controlled coppercoating method for the preparation of. The decay time of ml gives the relaxation time of the piston used to deform the sample and the time t m of maximum of ml is controlled by both the relaxation time of the piston and decay time of charges on the newly created surfaces of crystals. The light output of mgo was found to be proportional to the total energy transferred from the projectile to the electrons in the phosphor lattice. Various optical parameters of interest have been obtained from the synthesized singly and doubly doped zno semiconductor phosphors with variable concentrations of manganese and selenium. If this is the first time you use this feature, you will be asked to authorise cambridge core to connect with your. The first one is the conventional solidstate reaction method and the second one is the solution reaction method which has newly been developed in this experiment. Mn thinfilm phosphors for flatpanel cathodoluminescent displays arltr1502 december 1997 approved for public release. A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. The observed splitting of the forbidden doublets which are. The fluorescent layer includes a plurality of parallel fluorescent. Mn, tb phosphors were prepared by firing an appropriate mixture of znse, tb2o3 and mncl2 with constant amount of nacl for each sample in a silica crucible.
Author links open overlay panel zifeng liao a 1 haofei xu b 1 weiren zhao a huanxin yang a jiyou zhong. Structural characterization was carried out on a series of znga2o4. Doped quantum dots for whitelightemitting diodes without reabsorption of multiphase phosphors. Pdf research progress of mn doped phosphors researchgate. Mn phosphors containing various mn contents were prepared. Read preparation and characterization of zn 2 sio 4. Mn phosphors to bombardment with various ions was determined as a function of ion energy, for energies smaller than 100 kev. The photoluminescence characteristics and crystal structure of the treated zns. Chandrappa department of chemistry, bangalore university, bangalore560 001, india k. In the case of the solid state reaction method, sio 2 and zno powders were mixed in the ball mill and fired at 800 for 4 h under an air atmosphere to. Synthesis of highly emissive mndoped znse nanocrystals without.
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