Facile synthesis of intense green light emitting LiGdF4:Yb,Er- based upconversion bipyramidal nanocrystals and their polymer composites

Hyejin Na, Jong Seok Jeong, Hye Jung Chang, Hyun You Kim, Kyoungja Woo, Kipil Lim, K. Andre Mkhoyan, Ho Seong Jang

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

A pathway for achieving intense green light emitting LiGdF 4:Yb,Er upconversion nanophosphors (UCNPs) via Y3+ doping is demonstrated. It was revealed that Y3+ doping initiated the formation of a tetragonal phase and affected the particle size. Single tetragonal-phase LiGd0.4Y0.4F4:Yb(18%),Er(2%) (LGY0.4F:Yb,Er) UCNPs exhibited strong upconversion (UC) green luminescence and tetragonal bipyramidal morphologies. They showed 1325 and 325-fold higher photoluminescence intensity than the 0 and 80 mol% Y 3+-doped LiGdF4:Yb,Er UCNPs, respectively. Additionally the particle size (edge length) of LiGdF4:Yb,Er-based upconversion tetragonal bipyramids (UCTBs) was controlled from 60.5 nm to an ultrasmall size of 9.3 nm with varying Y3+ doping concentration. In an LGY 0.4F:Yb,Er UCTB, uniform distribution of all constituent elements was directly confirmed by using high-angle annular dark-field scanning transmission electron microscopy and energy-filtered transmission electron microscopy (EFTEM) image analyses. In particular, existence of activator Er3+ ions with extremely small quantity was clearly seen over a particle on the EFTEM image. Moreover, the LGY0.4F:Yb,Er UCTBs were successfully incorporated into the polydimethylsiloxane (PDMS) polymer and the highly transparent UCTB-PDMS composites showed bright green light under the excitation of 980 nm infrared light.

Original languageEnglish (US)
Pages (from-to)7461-7468
Number of pages8
JournalNanoscale
Volume6
Issue number13
DOIs
StatePublished - Jul 7 2014

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