光电子技术
光電子技術
광전자기술
OPTOELECTRONIC TECHNOLOGY
2010年
1期
37-40,44
,共5页
ZnMoO_4:Tb~(3+)%发光二极管%荧光粉%光致发光
ZnMoO_4:Tb~(3+)%髮光二極管%熒光粉%光緻髮光
ZnMoO_4:Tb~(3+)%발광이겁관%형광분%광치발광
ZnMoO_4:Tb~(3+)%LED%phosphor%photoluminescence
采用高温固相法制备了ZnMoO_4:Tb~(3+)绿色荧光粉,对样品进行了X射线衍射(XRD)和荧光光谱测定.XRD结果表明,样品在800℃时能得到单一ZnMoO_4相.激发光谱由1个宽带峰和若干个尖峰组成,宽带属于Mo~(6+)-O~(2-)电荷迁移吸收带(CT),并且发现宽带峰位随Tb~(3+)掺杂浓度增加而出现蓝移,尖峰属于Tb~(3+)的4f-4f跃迁,最强激发峰位于377 nm处.发射光谱由四组峰组成,最强发射峰在543 nm处,对应于Tb~(3+)的~5D_4-~7F_5跃迁,属于磁偶极跃迁.研究了ZnMoO_4:Tb~(3+)荧光粉在543 nm的主发射峰强度随Tb~(3+)掺杂浓度的变化情况.结果显示,随Tb~(3+)浓度的增加,发射峰强度先增大;当Tb~(3+)浓度x=0.15时,峰值强度最大;而后随Tb~(3+)浓度增加,峰值强度减小.荧光寿命测试得到Tb~(3+)的~5D_4-~7F_5跃迁发射的荧光寿命值为0.506 ms.光谱特性研究表明,ZnMoO_4:Tb~(3+)是一种可能应用在白光LED上的绿基色发光材料.
採用高溫固相法製備瞭ZnMoO_4:Tb~(3+)綠色熒光粉,對樣品進行瞭X射線衍射(XRD)和熒光光譜測定.XRD結果錶明,樣品在800℃時能得到單一ZnMoO_4相.激髮光譜由1箇寬帶峰和若榦箇尖峰組成,寬帶屬于Mo~(6+)-O~(2-)電荷遷移吸收帶(CT),併且髮現寬帶峰位隨Tb~(3+)摻雜濃度增加而齣現藍移,尖峰屬于Tb~(3+)的4f-4f躍遷,最彊激髮峰位于377 nm處.髮射光譜由四組峰組成,最彊髮射峰在543 nm處,對應于Tb~(3+)的~5D_4-~7F_5躍遷,屬于磁偶極躍遷.研究瞭ZnMoO_4:Tb~(3+)熒光粉在543 nm的主髮射峰彊度隨Tb~(3+)摻雜濃度的變化情況.結果顯示,隨Tb~(3+)濃度的增加,髮射峰彊度先增大;噹Tb~(3+)濃度x=0.15時,峰值彊度最大;而後隨Tb~(3+)濃度增加,峰值彊度減小.熒光壽命測試得到Tb~(3+)的~5D_4-~7F_5躍遷髮射的熒光壽命值為0.506 ms.光譜特性研究錶明,ZnMoO_4:Tb~(3+)是一種可能應用在白光LED上的綠基色髮光材料.
채용고온고상법제비료ZnMoO_4:Tb~(3+)록색형광분,대양품진행료X사선연사(XRD)화형광광보측정.XRD결과표명,양품재800℃시능득도단일ZnMoO_4상.격발광보유1개관대봉화약간개첨봉조성,관대속우Mo~(6+)-O~(2-)전하천이흡수대(CT),병차발현관대봉위수Tb~(3+)참잡농도증가이출현람이,첨봉속우Tb~(3+)적4f-4f약천,최강격발봉위우377 nm처.발사광보유사조봉조성,최강발사봉재543 nm처,대응우Tb~(3+)적~5D_4-~7F_5약천,속우자우겁약천.연구료ZnMoO_4:Tb~(3+)형광분재543 nm적주발사봉강도수Tb~(3+)참잡농도적변화정황.결과현시,수Tb~(3+)농도적증가,발사봉강도선증대;당Tb~(3+)농도x=0.15시,봉치강도최대;이후수Tb~(3+)농도증가,봉치강도감소.형광수명측시득도Tb~(3+)적~5D_4-~7F_5약천발사적형광수명치위0.506 ms.광보특성연구표명,ZnMoO_4:Tb~(3+)시일충가능응용재백광LED상적록기색발광재료.
The phosphor was prepared with solid-state reaction method at high temperature and its crystal structure and luminescent properties are investigated. The X-ray diffraction patterns (XRD) showed that the phosphor calcinated at 800℃ can obtain pure ZnMoO_4phase. The excitation spectrum consisted of one broad band and some narrow peaks, the broad band belongs to Mo~(6+)-O~(2-) charge transitions (CT) and all of narrow peaks are attributed to 4f-4f transitions on Tb~(3+). The strongest excitation peak is located at 377 nm correspond to magnetic dipole transitions. The blue shift of a charge transition (CT) broad band could be observed in the excitation spectra of various Tb~(3+) doping concentrations. The effect of investigated, and the results show that the emission spectrum intensity increased with the Tb~(3+) concentration increased, and the maximum value appeared when x=0.15. Fluorescence lifetimes of the Tb~(3+) in ZnMoO_4 are measured to be about 0.506 ms. The spectrum characteristics show that ZnMoO_4:Tb~(3+) is a promising green-emitting phosphor for LED applications.
