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Synthesis And Properties Of Long Lasting Phosphorescent Glass/Ceramics

Posted on:2004-06-19Degree:MasterType:Thesis
Country:ChinaCandidate:A L ZhuFull Text:PDF
GTID:2121360095452163Subject:Applied Chemistry
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Glass and ceramics are two kinds of non-metal inorganic material. Special glass /ceramics are in urgent need in certain especial fields with the rapid development of economy and technology, such as x-ray-to-light conversion glass, sun light conversion glass for agriculture, aviation ceramics, luminescent ceramics, et al. Long lasting phosphorescent glass/ceramics (LLPG/LLPC) can store sunlight in day and release visible-light at night. LLPG/LLPC will be more prosperous application, for harmless to environment as decorating and lighting materials.In this thesis, the synthesis and phosphorescent properties of the tricolor LLPG/LLPC have been researched.1 The Technological Process of Synthesis and Methods of Measurement for LLPG/LLPC.LLPG/LLPC samples were prepared with two methods. Glass A(GA) and CZTP-TM(RE) powder were synthesized by solid state reaction under high temperature (one step method),Glass B(GB)/Glass C(GC)/Ceramics B(CB) /Ceramics P(CP) were prepared by firing the mixture of the powder of glass host and long lasting phosphorescent powder.The photoluminescence spectra and the decay curves were recorded on RF-5301PC. X-ray powder diffractions were measured for the samples by the D/max-RA x-ray powder diffraction analytical instrument, the glow curve was recorded by ELSES-7188 thennoluminescence reader.2 Green Long Lasting Phosphorescent Glass (GLLPG)The powder of glass host 33SrO-67B2O3(SB) and 26SrO·OAl2O3 ·30B2O3·12SiO2·12Na2O (SABSN) were prepared with conventionalhigh temperature process.40SrO·30Al2O3·30B2O3·0.1Eu2Os·0.1Dy2O3 glass (GA) were prepared with solid state reaction under reduction atmosphere (5%H2+95%N2) (one step method), (1-x) SB + x SAED glass (GB) and (1-x) SABSN+x SAED glass(GC) were prepared by firing SB /SABSN and SAED together(two steps method). The band emission spectra of SAED, GA, GB and GC peak at 525nm,493nm,426nm and 516 nm, respectively. The fluorescence intensity and afterglow were decreased in the sequence of SAED, GC, GB and GA. The peaks of emission spectra were shifted due to tfie different glass compositions. It was observed that the difference of luminescent properties of glasses synthesized by two kinds of methods. The SABSN glass host for synthesizing LLPG/LLPC was better than SB. The composition of glass host decided the glass network, which had great influence on GLLPG.3 Blue Long Lasting Phosphorescent Glass (BLLPG)Blue long lasting phosphorescent glass(GD) were prepared by firing Si2MgSi2O7;Eu,Dy(SMSB) and SABSN at the temperature of 1000℃ -1150℃ maintained for 5-10 minutes under air atmosphere. GD can be excited by light from 300 nm to 400 nm, and emit 450-500 nm light. The decay period was above 12 hours.4 Sensitization of Red CaZnTiO3: Pr (CZTP)The sensitizations of transition metal ions TM (TM=Bi3+,Cu2+,Mn2+, Pb2+) to CaZnTiO3: Pr have been researched. The luminescent effect of CZTP-Bi was best. The excitation spectra were obviously different from CZTP. There was no excitation 330 nm peak in CZTP-Bi, but the excitation intensity of 380 nm was twice of CZTP. Not only a new strong excitation band from 220-250 nm was appeared, but also the 400-500 nm excitation band were boosting up. Comparing to CZTP, the origination intensity of CZTP-Bi was increased 40%, the thermoluminescence peak was shifted about 97K-170K value to low temperature area. In conclusion, there may be an energy transition from Bi + to Pr3+ in CZTP-Bi, thesensitization of Bi3+ to Pr3+ was effective, which may be prolong the decay period.The major excitation peaks of CZTP-RE (RE=Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+)were 330 nm and 380 nm, CZTP-RE intensity was increased 10%~60%, 330 nm and 380 nm relative intensity were changed with the kinds of rare earth ions. The glow curves of thermoluminescence indicated that there were deeper trap energy in CZTP-RE crystal so as to prolong decay time of CaZnTiOs: Pr.5 Red Long Lasting Phosphorescent CeramicsBorate acid porcelainized CZTP. The preferable mole percent of borate a...
Keywords/Search Tags:tricolor, long lasting phosphorescence, glass/ceramics, synthesis
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