Visible emission from Ce-doped ZnO nanorods grown by hydrothermal method without a post thermal annealing process

Nanoscale Research Letters - Tập 7 - Trang 1-5 - 2012
Yong-Il Jung1,2, Bum-Young Noh1,2, Young-Seok Lee1, Seong-Ho Baek2, Jae Hyun Kim2, Il-Kyu Park1
1LED-IT Fusion Technology Research Center and Department of Electronic Engineering, Yeungnam University, Gyeongbuk, Korea
2Energy Research Division, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu, Korea

Tóm tắt

Visible light-emitting Ce-doped ZnO nanorods [NRs] without a post thermal annealing process were grown by hydrothermal method on a Si (100) substrate at a low temperature of 90°C. The structural investigations of Ce-doped ZnO NRs showed that the Ce3+ ions were successfully incorporated into the ZnO lattice sites without forming unwanted Ce-related compounds or precipitates. The optical investigation by photoluminescence spectra shows that the doped Ce3+ ions in the ZnO NRs act as an efficient luminescence center at 540 nm which corresponds to the optical transition of 5d → 4f orbitals in the Ce3+ ions. The photoluminescence intensity of the Ce-doped ZnO NRs increased with the increasing content of the Ce-doping agent because the energy transfer of the excited electrons in ZnO to the Ce3+ ions would be enhanced by increased Ce3+ ions.

Tài liệu tham khảo

Wang ZL: Zinc oxide nanostructures: growth, properties and applications. Journal of Physics: Condensed Matter 2004, 16: R829-R858. 10.1088/0953-8984/16/25/R01 Remashan K, Hwang DK, Park SJ, Jang JH: Effect of rapid thermal annealing on the electrical characteristics of ZnO thin-film transistors. Jpn J App Phys 2008, 47: 2848–2853. 10.1143/JJAP.47.2848 Choi MY, Choi D, Jin MJ, Kim I, Kim SH, Choi JY, Lee SY, Kim JM, Kim SW: Mechanically powered transparent flexible charge-generating nanodevices with piezoelectric ZnO nanorods. Adv Mater 2009, 21: 2185–2189. 10.1002/adma.200803605 Lim JH, Kang CK, Kim KK, Park IK, Park SJ: UV electroluminescence emission from ZnO light-emitting diodes grown by high-temperature radio frequency sputtering. Adv Mater 2006, 18: 2720–2724. 10.1002/adma.200502633 Mordkovich VZ, Hayashi H, Haemori M, Fukumura T, Kawasaki M: Discovery and optimization of new ZnO-based phosphors using a combinatorial method. Adv Funct Mater 2003, 13: 519–524. 10.1002/adfm.200304335 John JS, Coffer JL: Size control of erbium-doped silicon nanocrystals. Appl Phys Lett 2010, 77: 1635–1637. Cheng B, Xiao Y, Wu G, Zhang L: Controlled growth and properties of one-dimensional ZnO nanostructures with Ce as activator/dopant. Adv Func Mater 2004, 14: 913–919. 10.1002/adfm.200305097 Li GR, Lu XH, Zhao WX, Su CY, Tong YX: Controllable electrochemical synthesis of Ce4+-doped ZnO nanostructures from nanotubes to nanorods and nanocages. Crystal Growth & Design 2008, 8: 1276–1281. 10.1021/cg7009995 Lang J, Han Q, Yang J, Li C, Li X, Yang L, Zhang Y, Gao M, Wang D, Cao J: Fabrication and optical properties of Ce-doped ZnO nanorods. J Appl Phys 2010, 107: 074302. 10.1063/1.3318613 Umar A, Karunagaran B, Suh EK, Hahn YB: Structural and optical properties of single-crystalline ZnO nanorods grown on silicon by thermal evaporation. Nanotechnology 2006, 17: 4072–4077. 10.1088/0957-4484/17/16/013 Yang Y, Lai H, Tao C, Yang H: Correlation of luminescent properties of ZnO and Eu doped ZnO nanorods. J Mater Sci: Mater Electron 2010, 21: 173–178. 10.1007/s10854-009-9889-0 Ahn CH, Kim YY, Kim DC, Mohanta SK, Cho HK: A comparative analysis of deep level emission in ZnO layers deposited by various methods. J Appl Phys 2009, 105: 013502. 10.1063/1.3054175 Wu C, Qiao X, Luo L, Li L: Synthesis of ZnO flowers and their photoluminescence properties. Mater Res Bull 2009, 43: 1883–1891. Blasse G, Bril A: A new phosphor for flying-spot cathode-ray tubes for color television: yellow-emitting Y3Al5O12-Ce3+. Appl Phys Lett 1967, 11: 53–55. 10.1063/1.1755025