PHOTOLUMINESCENCE PROPERTIES OF Nd3+, Yb3+ CODOPED Ga2O3 NANOPARTICLES
Abstract
The availability of sensitive photon detectors and inexpensive lasers allowed us to explore more efficient fluorescent probes that will work in the second near-infrared optical window. In this study, the optical properties of Nd3+ and Yb3+ co-doped Ga2O3 nanoparticles were studied. In order to indicate the correlation between particle size, crystallinity, and optical property of present samples XRD, TEM, and Photoluminescence analyses were performed. Various excitation wavelengths and dopant concentrations were used to understand the energy transfer mechanism in Nd3+ and Yb3+ co-doped Ga2O3 nanoparticles. As the excitation wavelength increased from 325 nm to 477 and 515 nm, Yb3+ emission peak intensity decreased while Nd3+ emission peak intensity increased. This inverse relationship between the emission intensities of Yb3+ and Nd3+ ion showed the presence of energy transfer between them. The resulting emission peaks were broad and weak, indicating the presence of a non-radiative decay channel due to the crystal defects.
Keywords
Luminescence, Energy Transfer, Gallium Oxide, Near Infrared Emission
Thanks
I would like to thank Prof. Cafer Yavuz and Prof. Jung H. Shin from KAIST (Korean Advanced Institute of Science and Technology) and Prof. Mustafa Selman Yavuz from Selçuk University for their valuable comments and technical supports in optical and structural analysis.
References
- [1] Zhou J, Liu Z, Li F. Upconversion nanophosphors for small-animal imaging. Chem Soc Rev, 2012;41(3):1323-1349.
- [2] Yu M, Li F, Chen Z, et al. Laser scanning up-conversion luminescence microscopy for imaging cells labeled with rare-earth nanophosphors. Anal Chem, 2009;81(3):930-935.
- [3] Naccache R, Rodríguez EM, Bogdan N, et al. High resolution fluorescence imaging of cancers using lanthanide ion-doped upconverting nanocrystals. Cancers (Basel), 2012;4(4):1067-1105.
- [4] Hong G, Antaris AL, Dai H. Near-infrared fluorophores for biomedical imaging. Nat Biomed Eng, 2017;1(1):0010.
- [5] Wang C, Cheng L, Liu Z. Drug delivery with upconversion nanoparticles for multi-functional targeted cancer cell imaging and therapy. Biomaterials, 2011;32(4):1110-1120.
- [6] Naczynski DJ, Tan MC, Zevon M, et al. Rare-earth-doped biological composites as in vivo shortwave infrared reporters. Nat Commun, 2013;4(1):2199.
- [7] Smith AM, Mancini MC, Nie S. Second window for in vivo imaging. Nat Nanotechnol, 2009;4(11):710-711.
- [8] Hong G, Lee JC, Robinson JT, et al. Multifunctional in vivo vascular imaging using near-infrared II fluorescence. Nat Med, 2012;18(12):1841-1846.
- [9] Li Y, Zeng S, Hao J. Non-invasive optical guided tumor metastasis/vessel imaging by using lanthanide nanoprobe with enhanced down-shifting emission beyond 1500 nm. ACS Nano, 2019;13(1):248-259.
- [10] Lim YT, Kim S, Nakayama A, Stott NE, Bawendi MG, Frangioni J V. Selection of quantum dot wavelengths for biomedical assays and imaging Mol Imaging, 2 (1): 50–64. Find this article online. Published online 2003.