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Intense visible upconversion and infrared emission in GeGaS: Er3 /Ho3 glass under 980 nm excitation

Authors: Himics Dianna | Střižík Lukáš | Oswald J. | Holubová Jana | Šlang Stanislav | Frumarová Božena | Wágner Tomáš

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Intense visible upconversion and infrared emission in GeGaS: Er3 /Ho3 glass under 980 nm excitation	It is known that the Yb3+ or Er3+ using as a sensitizer to increase the emission intensity and pump efficiency for Ho3+ ions under 980 nm commercial laser, but from our previous work is know, that the Yb3+ ions sensitization is ineffective in Ga-Ge-Sb-S chalcogenide glasses [1]. On the other hand, the trivalent Er3+ has been confirmed as an effective sensitizer in assisting the Ho3+ relevant emissions [2]. The energy transfer mechanisms, upconversion photoluminescence (UCPL) and near-infrared emissions in the Er3+, Ho3+, singly doped and Er3+/Ho3+-co-doped Ge28.125Ga6.25S65.625 chalcogenide glasses by exciting at 980 nm have been investigated. Three intense upconversion luminescence emissions are observed for Er3+/Ho3+-co-doped glasses at around 526, 546 and 658 nm, which correspond to Er3+: 2H11/2 → 4I15/2, Er3+: 4S3/2 → 4I15/2 + Ho3+: 5S2 (5F4) → 5I8, and Er3+: 4F9/2 → 4I15/2 + Ho3+: 5F5 → 5I8 transitions, respectively. Comparing the 0.2Er3+ and 0.2Er3+/0.05Ho3+ samples it is found that the red emission in the sample with 0.05% holmium is ten times stronger as in the sample single doped erbium and in the sample with maximum 0.5% erbium (0.5Er3+/0.05Ho3+) is much stronger as the green emissions, that confirms the availability of energy transfer mechanisms. The transition at 1.2 μm is observated only limited in low phonon energy chalcogenides, fluoride, oxyfluoride glass ceramics and is not possible in traditional oxide glasses such as silica or phosphate due to the strong multiphonon effect originated from their high phonon energies [3]. The present study demonstrates that the Er3+ addition into Ge28.1Ga6.3S65.6: 0.05Ho3+ chalcogenide glasses lead to sensitization of UCPL as well as 1.2 μm PL emissions, and the emergence of 1.2 μm emission proves the energy transfer (ET1) process.	upconversion photoluminescence; erbium; holmium; energy transfer; emission