Combustion synthesis of germanium phosphates Gd11–xyYbxEryGeP3O26 and their luminescence properties


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Abstract

The formation of germanium phosphates Gd11–xyYbxEryGeP3O26 containing 1 at % Er and 5 to 20 at % Yb upon gel combustion and annealing of intermediates was studied. Structure formation in germanium phosphates was shown to start with the crystallization of phosphate Gd3PO7 followed by its reaction with Gd2GeO5 to yield Gd11GeP3O26. The compounds prepared are crystallized in triclinic crystal system (space group P1). The unit cell parameters and unit cell volumes of Gd11–xyYbxEryGeP3O26 decrease with increasing dopant concentration in the phosphor: from V = 555 Å3 in Gd10.34Yb0.55Er0.11GeP3O26, where Yb: Er = 5: 1, to V = 549 Å3 in Gd9.24Yb1.65Er0.11GeP3O26, where Yb: Er = 15: 1. Upconversion luminescence spectra of germanium phosphates Gd11–xyYbxEryGeP3O26 were recorded. The luminescence spectra featured two bands: a strong band in the red, corresponding to the transition 4F9/24I15/2 (660 nm), and a weaker band in the green, corresponding to two transitions: 2H11/24I15/2 (λ = 525 nm) and 4S3/24I15/2 (λ = 550 nm) of Er3+ ions. The energy yields (Ben, %) were determined for the prepared phosphors. The highest value Ben = 0.54% was observed in phosphor Gd10.765Yb0.125Er0.11GeP3O26 where Yb: Er = 15: 1.

About the authors

V. A. Krut’ko

Kurnakov Institute of General and Inorganic Chemistry

Author for correspondence.
Email: kroutko@igic.ras.ru
Russian Federation, Moscow, 119991

M. G. Komova

Kurnakov Institute of General and Inorganic Chemistry

Email: kroutko@igic.ras.ru
Russian Federation, Moscow, 119991

D. V. Pominova

Prokhorov General Physics Institute

Email: kroutko@igic.ras.ru
Russian Federation, Moscow, 119991

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