高效率Tb^(3+)单掺绿色荧光粉的光致/应力发光研究  

Investigation on Photoluminescence and Mechanoluminescence of Single Tb^(3+)-doped Intense Green Phosphor

作　　者：陈慧敏 王龙 张盼 白西林 周国君 Chen Huimin;Wang Long;Zhang Pan;Bai Xilin;Zhou Guojun(College of Physics and Information Engineering,Shanxi Normal University,Taiyuan 030031;College of Chemistry and Material Science,Shanxi Normal University,Taiyuan 030031;School of Physics,Nankai University,Tianjin 300071)

机构地区：[1]山西师范大学物理与信息工程学院,太原030031 [2]山西师范大学化学与材料科学学院,太原030031 [3]南开大学物理科学学院,天津300071

出　　处：《化学学报》2023年第7期771-776,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.52202177);山西省基础研究计划(Nos.202103021223262,20210302124054);山西师范大学自然科学基金(No.JCYJ2022015)资助。

摘　　要：稀土离子Tb^(3+)被视为当前绿色荧光材料中最具潜力的激活剂之一.采用高温固相法制备了新型绿色荧光粉β-KMg(PO_(3))_(3):Tb^(3+),其在紫外光区域具有强的f-f跃迁激发峰,呈现出较高的荧光量子产率(90.74%),且色度坐标与商用绿色荧光粉接近,其发射峰源于Tb^(3+)的5D_(4)-7F_(J)(J=6, 5, 4, 3)跃迁发射;Tb^(3+)占据Mg^(2+)格位,由于电荷差而产生的缺陷被热释光验证,多种深度陷阱能级的存在使得该荧光粉具备优异的热稳定性.更重要的是,β-KMg(PO_(3))_(3):Tb^(3+)呈现出优异的应力发光特性,在应力刺激下陷阱能级中的电子及空穴分别被释放回Tb^(3+)的激发态及基态,实现Tb^(3+)的5D_(3)-7F_(J)(J=6,5,4)及5D_(4)-7F_(J)(J=6, 5, 4, 3)跃迁.该绿色荧光粉粉末及复合薄膜材料均呈现出优异的光致及应力发光性能,在固态照明、显示与应力传感等领域具有应用前景.Mechanoluminescent(ML)materials can directly convert mechanical energy into optical energy and play a significant role in stress monitoring,anti-counterfeiting,etc.However,most of green ML materials need to be synthesized under high temperature and reducing atmosphere,which makes the development of green ML materials urgent.Rare earth ion Tb^(3+)is regarded as one of the most potential activators in green phosphor materials.In this work,novel single Tb^(3+)-dopedβ-KMg(PO_(3))_(3) green phosphors were synthesized via high temperature solid state method.The structure was characterized via X-ray diffraction(XRD)and scanning electron microscope(SEM).The photoluminescent(PL)properties were studied by excitation and emission spectra.It shows strong f-f transition excitation peaks in the UV region with a high quantum yield of 90.74%.The color coordinate of β-KMg(PO_(3))_(3):Tb^(3+)is close to that of commercial green phosphor,resulting from the 5D_(4)-7F_(J)(J=6,5,4,3)transition emission of Tb^(3+).Tb^(3+)occupies Mg^(2+)sites,and the defects caused by charge difference are verified by thermoluminescence(TL).The existence of multiple trap levels makes the phosphors possess excellent thermal stability.More importantly,β-KMg(PO_(3))_(3):Tb^(3+)exhibits outstanding ML properties.The trap levels formed by the defects play a significant role in the process of ML.Under the stimulation of mechanical stress,the electrons and holes in the trap levels are released to the excited states and ground states of Tb^(3+)respectively,and the 5D_(3)-7F_(J)(J=6,5,4)and 5D_(4)-7F_(J)(J=6,5,4,3)transitions of Tb^(3+)are realized.Both the powders and the polydimethylsiloxane(PDMS)composite materials show excellent PL and ML properties.The high sensitivity to stress is attributed to the flexible structural framework ofβ-KMg(PO_(3))_(3),which is easy to generate high strain energy.The materials have promising application prospect in solid state lighting,display and stress sensing.

关 键 词：稀土离子Tb^(3+) β-KMg(PO_(3))_(3) 光致发光 应力发光 缺陷 

分 类 号：TQ422[化学工程]