Shin, Jeehae Kyhm, Ji-Hoon Hong, A-Ra Song, Jin Dong Lee, Kwangyeol Ko, Hyungduk Jang, Ho Seong 2024-01-19T21:04:08Z 2024-01-19T21:04:08Z 2021-09-05 2018-12-11 0897-4756 https://pubs.kist.re.kr/handle/201004/120575 Red, green, blue, and natural white upconversion (UC) luminescence colors are realized from the tetragonal-structured LiGdF4-based core/triple-shell (C/T-S) upconversion nanophosphors (UCNPs) and the C/T-S UCNP-incorporated polymer composites. The LiYF4:Yb cores are used as sensitized seeds for the formation of LiGdF4:Yb,Tm UC shell followed by the growth of LiGdF4:Tb,Eu color tuning shell. Finally, LiYF4 inert shell is grown on the core/shell/shell UCNPs, and LiYF4:Yb/LiGdF4:Yb,Tm/LiGdF4:Tb,Eu/LiYF4 C/T-S UCNPs exhibit enhanced UC luminescence. The single tetragonal-phased C/T-S UCNPs exhibit blue, green, and red UC luminescence, which is attributed to the electronic transitions in Tm3+ via energy transfer UC process and Tb3+ and Eu3+ via energy migration UC process, respectively. The multicolor UC emissions, including natural white, medium aquamarine, purple, and thistle color, are created by fine-tuning of the ratio of Tb3+ and Eu3+ in the color tuning shell. The transparent polymer composites are prepared by incorporating the C/T-S UCNPs into polydimethylsiloxane, and the polymer composites also exhibit red, green, blue, and natural white light UC emissions, indicating that these multicolor tunable LiYE4:Yb/LiGdF4:Yb,Tm/LiGdF4:Tb,Eu/LiYF4 C/T-S UCNPs have potential to be applied to transparent volumetric displays. English AMER CHEMICAL SOC NEAR-INFRARED LIGHT DUAL-MODE LUMINESCENCE ENERGY MIGRATION PHOTODYNAMIC THERAPY DOWN-CONVERSION NANOCRYSTALS EMISSION NANOPARTICLES CELL Multicolor Tunable Upconversion Luminescence from Sensitized Seed-Mediated Grown LiGdF4:Yb,Tm-Based Core/Triple-Shell Nanophosphors for Transparent Displays Article 10.1021/acs.chemmater.8b02497 1 CHEMISTRY OF MATERIALS, v.30, no.23, pp.8457 - 8464 CHEMISTRY OF MATERIALS 30 23 8457 8464 scie scopus 000453489300007 2-s2.0-85057043827 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article NEAR-INFRARED LIGHT DUAL-MODE LUMINESCENCE ENERGY MIGRATION PHOTODYNAMIC THERAPY DOWN-CONVERSION NANOCRYSTALS EMISSION NANOPARTICLES CELL upconversion nanophosphor transparent display