Elaboration, Structure, and Intense Upconversion in Transparent KYb₂F₇:Ho³⁺ Glass‐Ceramics

Abstract

Novel transparent oxyfluoride glass-ceramics containing KYb 2 F 7 : Ho 3+ nanocrystals were successfully elaborated by melt-quenching technique with further thermal treatment for the first time. Their structural and luminescent properties were investigated systemically by XRD, HRTEM, absorption spectra, upconversion spectra, and lifetime measurements. Under 980 nm laser excitation, all samples exhibited characteristic emissions of Ho 3+ . Attractively, the upconversion emissions of Ho 3+, especially green and near-infrared emissions, were enormously enhanced 190 times after crystallization. The incorporation of Ho 3+ into KYb 2 F 7 nanocrystals with lower phonon energy was responsible for this phenomenon. Our research may enrich the understanding of fluoride-nanocrystals-based transparent oxyfluoride glassceramics.

Eu3+ and Er3+ doped NaLu1Yb F4 (x= 0 ∼ 1) solid-solution self-crystallization nano-glass-ceramics: Microstructure and optical spectroscopy

“…So far, many fluoride NCs, such as REF 3 (RE = La -Lu), MF 2 (M = Pb, Ca, Sr, Ba), NaREF 4 (RE = Y, Gd, Lu), LiYbF 4 and KYb 2 F 7 , embedded GCs have been reported [11][12][13][14][15][16][17][18][19][20][21][22][23]. The incorporation of activators into fluoride lattice is generally based on the Ln 3+ diffusion process in the previously reported GC systems.…”

“…It is well known that the crystals structures affect the UC luminescence performance, so it is particularly important to choose the appropriate host materials [7][8][9][10]. Oxyfluoride glass ceramics (GCs) combine the advantage of the mechanical and chemical stability of the oxide glass and the low phonon energy of the precipitated fluoride crystal, which may become a desirable choice as the UC bulk hosts [11][12][13][14][15][16][17][18][19][20][21][22][23]. Generally, GCs were fabricated via controllable crystallization by heating precursor glasses (PGs) with specially designed compositions at a suitable temperature for the prescribed time of period [24].…”

Lanthanide-Doped KLu2F7 Nanoparticles with High Upconversion Luminescence Performance: A Comparative Study by Judd-Ofelt Analysis and Energy Transfer Mechanistic Investigation

“…Recently, orthorhombic KYb 2 F 7 nanocrystals with lanthanide ions arranged in tetrad clusters were found to effectively preserve the excitation and minimize the migration of excitation energy to defects8. So far, the study for orthorhombic KYb 2 F 7 and KLu 2 F 7 is only presented in the form of glass-ceramics910 or bulk single crystals11. Moreover, only several documents reported of the structural and upconversion properties for the nano-sized KLu 2 F 7 812 and KYb 2 F 7 matrix13, respectively.…”

Tb3+/Eu3+: YF3 nanophase embedded glass ceramics: Structural characterization, tunable luminescence and temperature sensing behavior

“…GCs are a kind of composite materials consisting of both crystalline and glassy phases, which are fabricated by a routine melt-quenching way followed by subsequent glass crystallization treatment [16][17][18][19][20][21][22][23][24].…”