红外与毫米波学报
紅外與毫米波學報
홍외여호미파학보
JOURNAL OF INFRARED AND MILLIMETER WAVES
2009年
4期
263-266
,共4页
万尤宝%吴宇容%张建新%杨培志%肖林荣%杨辉
萬尤寶%吳宇容%張建新%楊培誌%肖林榮%楊輝
만우보%오우용%장건신%양배지%초림영%양휘
闪烁晶体%温度梯度法%透过光谱%畸变%X射线激发发光光谱
閃爍晶體%溫度梯度法%透過光譜%畸變%X射線激髮髮光光譜
섬삭정체%온도제도법%투과광보%기변%X사선격발발광광보
scintillation crystal%temperature gradient technique%transmission spectrum%degeneration%x-ray excited luminescence spectrum
利用多坩埚温度梯度法生长了PbWO_4和BaF_2:PbWO_4晶体,研究了PbWO_4、退火PbWO_4和BaF_2:PbWO_4晶体的透过光谱和X射线激发光谱,结果发现这些光谱性质与晶体的组成和生长工艺密切相关,其中退火的影响较复杂.高温退火的PbWO_4晶体的透过光谱在360nm以上波段有较好的透过率,但是在320-360nm波段透过率反而略有降低;380nm以上波段的X射线激发光谱光谱强度较高,320~380nm波段光谱强度却略有降低.掺杂的离子改善了晶体的透过率和x射线激发发光光谱强度.利用晶体的生长工艺和组成与缺陷以及晶体光学性质之间的关系解释了这些现象产生的原因.BaF_2:PbWO_4掺杂晶体的X射线激发光谱的波形和发光峰强度均发生了很大程度的改变,与F-离子掺杂引发晶体[WO_4]~(2-)四面体基团畸变而产生的新的发光中心有关.
利用多坩堝溫度梯度法生長瞭PbWO_4和BaF_2:PbWO_4晶體,研究瞭PbWO_4、退火PbWO_4和BaF_2:PbWO_4晶體的透過光譜和X射線激髮光譜,結果髮現這些光譜性質與晶體的組成和生長工藝密切相關,其中退火的影響較複雜.高溫退火的PbWO_4晶體的透過光譜在360nm以上波段有較好的透過率,但是在320-360nm波段透過率反而略有降低;380nm以上波段的X射線激髮光譜光譜彊度較高,320~380nm波段光譜彊度卻略有降低.摻雜的離子改善瞭晶體的透過率和x射線激髮髮光光譜彊度.利用晶體的生長工藝和組成與缺陷以及晶體光學性質之間的關繫解釋瞭這些現象產生的原因.BaF_2:PbWO_4摻雜晶體的X射線激髮光譜的波形和髮光峰彊度均髮生瞭很大程度的改變,與F-離子摻雜引髮晶體[WO_4]~(2-)四麵體基糰畸變而產生的新的髮光中心有關.
이용다감과온도제도법생장료PbWO_4화BaF_2:PbWO_4정체,연구료PbWO_4、퇴화PbWO_4화BaF_2:PbWO_4정체적투과광보화X사선격발광보,결과발현저사광보성질여정체적조성화생장공예밀절상관,기중퇴화적영향교복잡.고온퇴화적PbWO_4정체적투과광보재360nm이상파단유교호적투과솔,단시재320-360nm파단투과솔반이략유강저;380nm이상파단적X사선격발광보광보강도교고,320~380nm파단광보강도각략유강저.참잡적리자개선료정체적투과솔화x사선격발발광광보강도.이용정체적생장공예화조성여결함이급정체광학성질지간적관계해석료저사현상산생적원인.BaF_2:PbWO_4참잡정체적X사선격발광보적파형화발광봉강도균발생료흔대정도적개변,여F-리자참잡인발정체[WO_4]~(2-)사면체기단기변이산생적신적발광중심유관.
PbWO_4 and BaF_2 :PbWO_4 were grown by multi-crucible temperature gradient system.The transmittance spectra and x-ray excited luminescence spectra of as-grown PbWO_4, annealed PbWO_4 and annealed BaF_2: PbWO_4 were studied.The results reveal that these properties are related to the composition and growth arts of the crystals.The facts are complicated for the crystals annealing.In the wavelength range above 360nm,the transmittance for the annealed crystal is better than that of the as-grown crystal, while it is a little weaker than that of the as-grown crystal in the wavelength range of 320 ~360nm.For the x-ray excited luminescence spectra, the spectrum intensity of the annealed crystal is higher than that of as-grown crystal in the wavelength range above 380nm, while it is a little weaker than that of as-grown crystal in the wavelength range of 320~380nm.The doping ions improve the transmittance and the x-ray excited luminescence spectrum intensity.These phenomena are explained based on the relations of the defect, crystal growth arts and the optical properties of these crystals.For the BaF_2:PbWO_4 crystal, it' s peak shape and intensity of x-ray excited luminescence spectrum are evidently changed than PbWO_4 crystal.The phenomenon may relate to the fact that [WO_4]~(2-) tetrahedron of the crystal is degenerated when it is doped with F~- ions, and the degeneration will induce a new luminescent center.