Optical characterization of gold and Er3+:Y2O3 nanoparticles for biosensor applications

Kelly L. Nash; Raylon M. Yow; Doug M. Dee; Guang-Yin Swanland; John B. Gruber; Dhiraj K. Sardar; Maogen Zhang; Waldemar Gorski

doi:10.1117/12.699080

14 February 2007 Optical characterization of gold and Er³⁺:Y₂O₃ nanoparticles for biosensor applications

Kelly L. Nash, Raylon M. Yow, Doug M. Dee, Guang-Yin Swanland, John B. Gruber, Dhiraj K. Sardar, Maogen Zhang, Waldemar Gorski

Author Affiliations +

Proceedings Volume 6449, Genetically Engineered and Optical Probes for Biomedical Applications IV; 64490J (2007) https://doi.org/10.1117/12.699080
Event: SPIE BiOS, 2007, San Jose, California, United States

Abstract

Highly luminescent nanoparticles, such as, trivalent erbium-doped yttrium-oxide, Er³⁺:Y₂O₃, are expected to have a wide range of applications, including imaging, range finding, flash lidar, and other remote-sensing possibilities as well as medical applications. These particles are synthesized by the precipitation from a homogeneous solution of the metal ions and urea at elevated temperatures. The morphology of the calcinated materials, revealed through SEM, shows uniformly spherical aggregates 200 nm or less depending on the ratio of the metal ions in the initial solution. Room temperature optical absorption and emission spectra show that the trivalent erbium ions in Er³⁺:Y₂O₃ nanocrystals possess sharp absorption lines and strong emission in near infrared region that are characteristic of Er ³⁺:Y₂O₃ grown as large single crystals. Low temperature (8 K) spectra obtained from these particles were analyzed in detail for the crystal-field splitting of the ^2S+1L_J multiplet manifolds of Er³⁺(4f¹¹) including the ground-state manifold ⁴I_15/2, and excited manifolds ⁴I_9/2, ⁴F_9/2, ⁴S_3/2, ²H_11/2, ⁴F_7/2, ⁴F_5/2, and ⁴F_3/2. Fluorescence lifetimes and results from an analysis of the intensities of manifold-to-manifold transitions are also reported. Similarity of the nanocrystalline and large single crystal Er³⁺:Y₂O₃, we propose that the simple, inexpensive method described in this study will lead to further investigation of these nanocrystals for their optical properties, especially in the near infrared region of the spectrum.

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Kelly L. Nash, Raylon M. Yow, Doug M. Dee, Guang-Yin Swanland, John B. Gruber, Dhiraj K. Sardar, Maogen Zhang, and Waldemar Gorski "Optical characterization of gold and Er³⁺:Y₂O₃ nanoparticles for biosensor applications", Proc. SPIE 6449, Genetically Engineered and Optical Probes for Biomedical Applications IV, 64490J (14 February 2007); https://doi.org/10.1117/12.699080

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