1、第 44 卷 第 2 期2023年 2 月Vol.44 No.2Feb.,2023发光学报CHINESE JOURNAL OF LUMINESCENCEUpconversion Luminescence of CaSc2O4Er,Nd Nanocrystals Under 808 nm/980 nm Near Infrared ExcitationCUI Wenhao1，PENG Yaru1*，LI Jing1*，HUANG Yuxin1，CHEN Li1，2（1.School of Materials Science and Engineering，Changchun University
2、of Technology，Changchun 130012，China；2.Advanced Institute of Materials Science，Changchun University of Technology，Changchun 130012，China）*Corresponding Authors，E-mail：；Abstract：A series of CaSc2O4Er3+，Nd3+nanocrystals were synthesized by the hydrothermal method.The luminescence properties of the CaS
3、c2O4Er3+，Nd3+oxide crystals in the visible-light and near infrared（NIR）regions were investigated in detail as the Nd3+concentrations and excited wavelengths vary.Under 808 nm excitation，the luminescence intensity of Er3+ions appears to be enhanced as the concentration of Nd3+ions increase.The relati
4、ve red intensity also has the slight enhancement.Under 980 nm excitation，Nd3+ions hardly absorb 980 nm photons，only the absorption and emission of Er3+ions are found.The relative red intensity has no change.Furthermore，only the emission of Er3+ion was observed in NIR spectrum，which is consist as the
5、 visible spectrum.The detailed study reveals the possible upconversion luminescence（UCL）mechanism involved in a novel CaSc2O4Er3+，Nd3+nanocrystals under 808 nm and 980 nm NIR excitation.Key words：upconversion luminescence（UCL）；Nd3+ions；Er3+ions；CaSc2O4 nanocrystals；near infrared（NIR）excitationCLC nu
6、mber：O482.31 Document code：A DOI：10.37188/CJL.20220336808 nm/980 nm 近红外光激发下 CaSc2O4Er,Nd纳米晶的上转换发光特性崔文豪1，彭亚茹1*，李静1*，黄宇欣1，陈力1，2（1.长春工业大学 材料科学与工程学院，吉林 长春130012；2.长春工业大学 材料科学高等研究院，吉林 长春130012）摘要：通过水热法合成了一系列 CaSc2O4Er3+，Nd3+纳米晶。随着 Nd3+浓度和激发波长的变化，详细研究了CaSc2O4Er3+，Nd3+氧化物在可见光和近红外（NIR）区域的发光特性。在 808 nm 激发下，E
7、r3+离子的发光强度随着 Nd3+离子浓度的增加出现增强。相对的红色强度也有轻微的增强。在 980 nm 激发下，Nd3+离子几乎不吸收980 nm 的光子，只有 Er3+离子的吸收和发射被发现。相对的红色强度没有变化。此外，在近红外光谱中，只观察到 Er3+离子的发射，这与可见光光谱一致。详细的研究揭示了新型 CaSc2O4Er3+，Nd3+纳米晶在 808 nm 和980 nm近红外激发下的上转换发光（UCL）机制。关键词：上转换发光；Nd3+离子；Er3+离子；CaSc2O4 纳米晶；近红外激发Article ID：1000-7032（2023）02-0289-09收稿日期：202209
8、15；修订日期：20220928基金项目：吉林省自然科学基金（20220101024JC，20200201247JC，20170520110JH）；国家自然科学基金（11504029，11474035）Supported by Natural Science Foundation of Jilin Province（20220101024JC，20200201247JC，20170520110JH）；National Natural Science Foundation of China（11504029，11474035）第 44 卷发光学报1IntroductionNormally,lan
9、thanide-doped upconversion luminescent（UCL）materials with long lifetime and stepped energy structure into the hosts,are used to absorb multi-photons to produce higher energy anti-Stokes luminescence1-4.And with rare earth elements own the characteristics of large Stokes shift,sharp emission peak,lon
10、g fluorescence lifetime,high chemical and photochemical stability,rare earth doped upconversion materials have shown excellent application prospects in the fields of display lighting,biological imaging,photovoltaic cells,optical temperature sensors,etc5-13.Studies found that the hosts have a great i
11、mpact on the overall luminescence efficiency of the material,which can be broadly divided into fluoride,oxide,sulfide,etc.At present,the most effective UCL occurs in fluoride1,14,as a result of the low phonon energy of fluoride,which can suppress non-radiation relaxation.However,the chemical stabili
12、ty and thermal stability of fluoride are not ideal.Considering the stability of the hosts,people prefer to seek high-efficiency oxide upconversion materials,and they also have the advantages of high solubility to ions,simple preparation process and less environmental requirements15.The rare earth el
13、ement scandium（Sc）is located at the top of the tertiary group（B）and has an atomic number of only 21,which gives Sc3+distinctive physicochemical properties compared to other rare earth ions such as Y3+and Lu3+ions.Sc has the smallest radius16-17,so the doped ions are closer to each other,which facili
14、tates the energy transfer（ET）efficiency between doped ions18.Currently,research findings show that orthorhombic CaSc2O4 oxide material with a lower cutoff phonon energy can exhibit efficient UCL,which is an excellent host material.Such as,Xiang et al.demonstrate that CaSc2O4Yb3+,Er3+is a promising c
15、andidate for temperature sensing with multipath,high sensitivity,and superior resolution19.Wei et al.announce a strong green emission in CaSc2O4Yb3+,Tb3+with the green to red ratio as high as 4516.And a strong UCL was observed in CaSc2O4Ho3+,Yb3+20-21.However,up to now,little work investigates the U
16、CL performance and ET mechanism of CaSc2O4Er3+,Nd3+nanocrystals under 808 nm and 980 nm excited wavelengths.And Nd3+ions can realize upconversion emissions under 808 nm excitation where the water absorption is about 20 times lower than that of Yb3+ions.Meanwhile,the absorption cross section of Nd3+is much larger.Thus,co-doped Nd3+ions are of great significance to the UCL study.In this work,we prepared the series of CaSc2O41%Er3+,x%Nd3+（x=0.5,1,2,3）nanocrystals by hydrothermal method,and mainly a
