光谱学与光谱分析 |
|
|
|
|
|
Crystal Structure and Upconversion Emission of Yb3+/Er3+-Co-Doped NaYF4 Nanocrystals |
YAO Li-li, LUO Li*, DONG Guo-shuai,WANG Yin-hai |
School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China |
|
|
Abstract Yb3+/Er3+-co-doped cubic NaYF4 and Yb3+/Er3+/Gd3+-tri-doped hexagonal NaYF4 nanocrystals were synthesized by a modified coprecipitation method with ethylenediamine tetraacetic acid (EDTA) as chelating agent. The samples’ morphology, crystal phase and upconversion emission were measured with transmission electron microscope (TEM), X-ray diffraction patterns (XRD) and upconversion luminescence spectrum. TEM and XRD results showed that the phase transition from cubic to hexagonal was promoted through Gd3+ doping. It has been reported that the upconversion efficiency of hexagonal NaYF4 is higher than that of cubic NaYF4, however, the effect of crystal phase on upconversion luminescence has not been well understood. This work focuses analysis of measurement results to compare the effect of crystal phase on the crystal field energy splitting and upconversion emission intensity as well as emission color, and a mechanism of luminescence enhancement and color tunability are revealed. Strong visible upconversion luminescence can be seen clearly by the naked eyes in both cubic phase and hexagonal phase samples upon excitation by a 980 nm laser diode with power of 10 mW, consisting of green emissions centered at around 525/550 nm originating from the transitions of 2H11/2/4S3/2→4I15/2 and red emission at about 657 nm from 4F9/2 to 4I15/2 of Er3+ ions respectively. In comparison to cubic sample, the hexagonal phase sample presented much stronger and sharper upconversion luminescence, whose emission efficiency was enhanced 10 times with an additional transition of 2H9/2→4I13/2 at 557 nm, furthermore, the intensity ratio of red to green emission increased from 2∶1 to 3∶1. Doping NaYF4 nanocrystals with Gd3+ ions induced the hexagonal-to-cubic phase transition and thus decreased the crystal symmetry, consequently increased absorption cross-section and 4f—4f transition probabilities by relaxing forbidden selection rules, resulting in stronger emission. In the mean time, the decreasing unit-cell volume of the hexagonal phase increased the crystal field strength around the dopant ions and consequently led to that hexagonal phase samples present much sharper emission compared to cubic counterparts. It demonstrates that phase transition can tune crystal field energy splitting, luminescence intensity and emission color.
|
Received: 2013-03-07
Accepted: 2013-06-11
|
|
Corresponding Authors:
LUO Li
E-mail: luoli@gdut.edu.cn
|
|
[1] Gao Dangli, Zhang Xiangyu, Gao wei, J. Appl. Phys., 2012, 111: 033505. [2] Zou Wenqiang, Cindy Visser, Jeremio A Maduro. Nature Photonics, 2012, 6:560. [3] Wang Haiqiao, Miroslaw Batentschuk, Andres Osvet. Adv. Mater., 2011, 23: 2675. [4] Wang Guofeng, Peng Qing, Li Yadong. Chem. Eur. J. 2010, 16: 4923. [5] Chen Daqin, Huang Ping, Yu Yunlong. Chem. Commun., 2011, 47: 5801. [6] Tian Gan, Gu Zhanjun, Zhou Liangjun. Adv. Mater., 2012, 24: 1226. [7] Zhang Jingpu, Mi Congcong, Wu Hongyan. Aalytical Biochemistry, 2012, 421: 673. [8] He Meng, Huang Peng, Zhang Chunlei. Chem. Eur. J., 2012, 18: 5954. [9] Wang Feng, Han Yu, Lim Chin Seong. Nature, 2010, 463: 1061. [10] Zeng Songjun, Xiao Junjie, Yang Qibin. J. Mater. Chem., 2012, 22: 9870. [11] Li Jing, Zhang Jiahua, Hao Zhendong. Appl. Phys. Lett., 2012, 101: 121905. [12] Yi Guangshun, Peng Yanfen, Gao Zhiqiang. Chem. Mater., 2011, 23: 2729. [13] Teng Xue, Zhu Yihan, Wei wei. J. Am. Chem. Soc., 2012, 134: 8340. |
[1] |
GU Yi-lu1, 2,PEI Jing-cheng1, 2*,ZHANG Yu-hui1, 2,YIN Xi-yan1, 2,YU Min-da1, 2, LAI Xiao-jing1, 2. Gemological and Spectral Characterization of Yellowish Green Apatite From Mexico[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 181-187. |
[2] |
ZHOU Bei-bei1, LI Heng-kai1*, LONG Bei-ping2. Variation Analysis of Spectral Characteristics of Reclaimed Vegetation in an Ionic Rare Earth Mining Area[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3946-3954. |
[3] |
ZHANG Hao-yu1, FU Biao1*, WANG Jiao1, MA Xiao-ling2, LUO Guang-qian1, YAO Hong1. Determination of Trace Rare Earth Elements in Coal Ash by Inductively Coupled Plasma Tandem Mass Spectrometry[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(07): 2074-2081. |
[4] |
CHEN Di, SONG Chen, SONG Shan-shan, ZHANG Zhi-jie*, ZHANG Hai-yan. The Dating of 9 Batches of Authentic Os Draconis and the Correlation
Between the Age Range and the Ingredients[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(06): 1900-1904. |
[5] |
WANG Mei-li1, 2, SHI Guang-hai2*, ZHANG Xiao-hui1, YANG Ze-yu2, 3, XING Ying-mei1. Experimental Study on High-Temperature Phase Transformation of Calcite[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1205-1211. |
[6] |
ZONG Zhi-fang1, XU Wei-cheng2, CHEN De-peng1*, TANG Gang1, ZHOU Xiao-hui1, DONG Wei1, WU Yu-xi2. Preparation Mechanism of Decylic Acid-Palmitic Acid/SiO2@TiO2
Photocatalytic Phase Change Microcapsules Based on
Multiple Spectrum Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1306-1313. |
[7] |
HE Yan1, SU Yue1, YANG Ming-xing1, 2*. Study on Spectroscopy and Locality Characteristics of the Nephrites in Yutian, Xinjiang[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(12): 3851-3857. |
[8] |
WANG Chong1, WANG Jing-hua1, 2, LI Dong-dong1, SHE Jiang-bo2. Preparation of Gd3+-Doped LiYF4∶Yb3+/Ho3+ Micro-Crystal and the Application Research in Anti-Counterfeiting[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(11): 3581-3587. |
[9] |
SHI Dong-dong, CAO Zhao-bin, HUAN Yan-hua, GONG Yan-chun, WU Wen-yuan, YANG Jun*. Reflection Polarization Spectral Characteristics of High Performance Coating Material La2Zr2O7[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 2995-2999. |
[10] |
ZHANG Li-gang1, MA Li-hong1*, ZHAO Su-ling2, XU Zheng2, YANG Hai-jun1, LI Chen-pu1, WANG Ke1, LIU Gui-xia1, BAI Yong-qing1, SHEN Wen-mei1. Effect of Reaction Temperature on the Luminescence and Morphology of Na3ScF6∶Yb/Er Nanocrystals[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3068-3072. |
[11] |
HU Xuan1, CHENG Zi-hui1*, ZHANG Shu-chao2, SHI Lei2. Matrix Separation-Determination of Rare Earth Oxides in Bauxite by
Inductively Coupled Plasma-Atomic Emission Spectrometry[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3130-3134. |
[12] |
JUMAHONG Yilizhati1, 2, TAN Xi-juan1, 2*, LIANG Ting1, 2, ZHOU Yi1, 2. Determination of Heavy Metals and Rare Earth Elements in Bottom Ash of Waste Incineration by ICP-MS With High-Pressure Closed
Digestion Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3168-3173. |
[13] |
TAO Yu-rui, WANG Hong-bo*, WANG Hai-hua*, ZHOU Mi*. Pressure-Induced Phase and Isomer Transition of Dicyandiamide[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3046-3051. |
[14] |
ZHU Zhao-zhou1*, YANG Xin-xin1, LI Jun1, HE Hui-jun2, ZHANG Zi-jing1, YAN Wen-rui1. Determination of Rare Earth Elements in High-Salt Water by ICP-MS
After Pre-Concentration Using a Chelating Resin[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(06): 1862-1866. |
[15] |
SHAO Ke-man, FU Gui-yu, CHEN Su-yan, HONG Cheng-yi, LIN Zheng-zhong*, HUANG Zhi-yong*. Preparation of Molecularly Imprinted Fluorescent Probe for Rare Earth Complex and Determination of Malachite Green Residue[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(03): 808-813. |
|
|
|
|