湖南科技大学学报（自然科学版）
湖南科技大學學報（自然科學版）
호남과기대학학보（자연과학판）
JOURNAL OF HUNAN UNIVERSITY OF SCIENCE & TECHNOLOGY（NATURAL SCIENCE EDITION）
2014年
1期
124-128
,共5页
稀土离子%上转换%发光%纳米晶
稀土離子%上轉換%髮光%納米晶
희토리자%상전환%발광%납미정
rare earth ions%upconversion%luminescence%nanocrystals
稀土离子Pr3＋和Nd3＋对上转换材料的发光具有特殊的敏化作用，通过在NaLuF4：Yb3＋，Er3＋纳米晶中共掺杂稀土离子Pr3＋和Nd3＋并研究它们与发光中心 Er3＋之间的能量传递机制。采用水热法分别合成了 Pr3＋和 Nd3＋掺杂的NaLuF4：Yb3＋，Er3＋纳米晶，直径约为15 nm，具有六方相结构。发光特性分析表明，随 Pr3＋离子掺杂浓度增加，NaLuF4：Yb3＋，Er3＋纳米晶的656 nm红光强度相对于544 nm绿光逐渐减弱；但是随着Nd3＋离子掺杂浓度增加，其发光红绿比刚好出现相反的变化。基于功率变换谱和简化能级图分析了 Pr3＋-Er3＋和 Nd3＋-Er3＋之间的能量传递机制，揭示了 Er3＋的4I11/2能级的电子布居在多个跃迁过程中所起的关键作用。
稀土離子Pr3＋和Nd3＋對上轉換材料的髮光具有特殊的敏化作用，通過在NaLuF4：Yb3＋，Er3＋納米晶中共摻雜稀土離子Pr3＋和Nd3＋併研究它們與髮光中心 Er3＋之間的能量傳遞機製。採用水熱法分彆閤成瞭 Pr3＋和 Nd3＋摻雜的NaLuF4：Yb3＋，Er3＋納米晶，直徑約為15 nm，具有六方相結構。髮光特性分析錶明，隨 Pr3＋離子摻雜濃度增加，NaLuF4：Yb3＋，Er3＋納米晶的656 nm紅光彊度相對于544 nm綠光逐漸減弱；但是隨著Nd3＋離子摻雜濃度增加，其髮光紅綠比剛好齣現相反的變化。基于功率變換譜和簡化能級圖分析瞭 Pr3＋-Er3＋和 Nd3＋-Er3＋之間的能量傳遞機製，揭示瞭 Er3＋的4I11/2能級的電子佈居在多箇躍遷過程中所起的關鍵作用。
희토리자Pr3＋화Nd3＋대상전환재료적발광구유특수적민화작용，통과재NaLuF4：Yb3＋，Er3＋납미정중공참잡희토리자Pr3＋화Nd3＋병연구타문여발광중심 Er3＋지간적능량전체궤제。채용수열법분별합성료 Pr3＋화 Nd3＋참잡적NaLuF4：Yb3＋，Er3＋납미정，직경약위15 nm，구유륙방상결구。발광특성분석표명，수 Pr3＋리자참잡농도증가，NaLuF4：Yb3＋，Er3＋납미정적656 nm홍광강도상대우544 nm록광축점감약；단시수착Nd3＋리자참잡농도증가，기발광홍록비강호출현상반적변화。기우공솔변환보화간화능급도분석료 Pr3＋-Er3＋화 Nd3＋-Er3＋지간적능량전체궤제，게시료 Er3＋적4I11/2능급적전자포거재다개약천과정중소기적관건작용。
The doping of rare earth ion Pr3+and Nd3+has unique sensitization effect on the luminescence of upconversion materials.In the submitted work,the energy transfer mechanisms between Pr3+/Nd3+and Er3+were investigated in NaLuF4:Yb3+,Er3+nanocrystals codoped with Pr3+or Nd3+ions.NaLuF4:Yb3+,Er3+nanocrystals codoped with Pr3+or Nd3+ions were synthesized by hydrothermal method which had an average diameter of 15 nm and hexagonal phase structures.The luminescent properties analysis indicated that the intensity ratio of 656 nm red to 544 nm green emission decreases with increasing the content of Pr3+ions.But,a completely contrary variation was observed with increasing the content of Nd3+ions.The energy transfer between Pr3+and Er3+or between Nd3+and Er3+were investigated based on the power dependence of emission intensity and simplified energy diagram,which indicated that the population of 4I11/2 state of Er3+ions plays a key role in many transitions.
