Abstract

Upconversion (UC) properties of Y₂O₃:Ho³⁺/Yb³⁺ spherical particles synthesized by spray pyrolysis were investigated by changing the dopant concentration and calcination temperature. Citric acid (CA), ethylene glycol (EG) and N, N-dimethylformamide (DMF) were used to control the microstructure of Y₂O₃:Ho³⁺/Yb³⁺ particles. In terms of achieving the highest UC green emission intensity, the optimal concentrations of Ho³⁺ and Yb³⁺ were found to be 0.3% and 3.0%, respectively. In addition, the UC intensity of Y₂O₃:Ho³⁺/Yb³⁺ showed a linear relationship with the crystallite size. The use of organic additives allows Y₂O₃:Ho³⁺/Yb³⁺ particles to have a spherical and dense structure, resulting in significantly reducing the surface area while maintaining high crystallinity. As a result, the UC emission intensity of Y₂O₃:Ho³⁺/Yb³⁺ particles having a dense structure showed the UC emission intensity about 3.8 times higher than that of hollow particles prepared without organic additives. From those results, when Y₂O₃:Ho³⁺/Yb³⁺ particles are prepared by the spray pyrolysis process, the use of the CA/EG/DMF mixtures as organic additives has been suggested as an effective way to substantially increase the UC emission intensity.

© 2021 Optical Society of Korea

Enhanced upconversion and near-infrared emissions of co-doped Ho³⁺/Yb³⁺ in TeO₂–ZnO–Na₂CO₃–La₂O₃ tellurite glasses

P. X. Le, Nguyen Minh Ty, Jianbei Qiu, Dacheng Zhou, and Ho Kim Dan
Opt. Mater. Express 9(10) 3998-4008 (2019)

Photoluminescence and attenuation of spray-pyrolysis-deposited erbium-doped Y₂O₃ planar optical waveguides

T. H. Hoekstra, L. T. H. Hilderink, P. V. Lambeck, and Th. J. A. Popma
Opt. Lett. 17(21) 1506-1508 (1992)

Upconversion emission and color tunability in Al₂Y₄O₉: Yb, Er inverse opal

Dong Yan, Jianbei Qiu, Zhengwen Yang, Zhiguo Song, Dacheng Zhou, Xue Yu, Yong Yang, Zhaoyi Yin, and Lei Yan
Opt. Mater. Express 2(5) 650-656 (2012)

Manipulation of microstructures and the stability of white emissions in NaLuF₄:Yb³⁺, Ho³⁺, Tm³⁺ upconversion crystals

Jiancheng Sun, Haoyue Hao, Weijiang Xu, Yinglin Song, Yuxiao Wang, and Xueru Zhang
Opt. Mater. Express 8(4) 1043-1057 (2018)

Spray pyrolysis prepared yellow to red color tunable Sr_1-xCa_xSe:Eu²⁺ phosphors for white LED

Wonkeun Chung, Hyunchul Jung, Chang Hun Lee, Jihyun Kim, and Sung Hyun Kim
Opt. Express 20(12) 12885-12892 (2012)