Influence of activator concentration on spectral-luminescence and scintillation properties of YAG:Ce crystals

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The luminescence and scintillation properties of  YAG:Ce crystals grown from the melts in vacuum has been analysed. We have investigated absorption spectra, X-ray excited luminescence (XRL), XRL decay kinetics and scintillation light yield in a wide range of activator concentrations (from 0.0036 at.% to 1.175 at.% substitution  of  Y in the c-positions of  garnet structure). The effective quenching of the intrinsic luminescence of antisite and vacancy defects of the crystal in the UV region with increasing activator concentration has been determined. The optimal concentration of the activator has been determined in order to increase the XRL intensity and the light output of scintillations of Сe3+ ions, taking into account the technological peculiarities of growing optically perfect single crystals with high concentration of Сe3+ ions by using the method of horizontal directional crystallisation in vacuum. The relations between the XRL kinetics and the activator concentration have been investigated. It has showed the possibility to obtain crystals with photon yield up to 25,000 ph/MeV.

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Sobre autores

V. Fedorov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Autor responsável pela correspondência
Email: fedorov-metrology@yandex.ru
Rússia, Moscow

E. Antonov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: fedorov-metrology@yandex.ru
Rússia, Moscow

I. Venevtsev

Peter the Great St. Petersburg Polytechnic University

Email: fedorov-metrology@yandex.ru
Rússia, St. Petersburg

V. Kanevsky

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: fedorov-metrology@yandex.ru
Rússia, Moscow

B. Nabatov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: fedorov-metrology@yandex.ru
Rússia, Moscow

E. Saltanova

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”; Moscow Institute of Physics and Technology (National Research University)

Email: fedorov-metrology@yandex.ru
Rússia, Москва; Dolgoprudny

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2. Fig. 1. Absorption spectra of IAG crystal samples:Ce thickness d: 6 – d = 690, 7 – d = 443, 9 – d = 37, 12 – d = 65 microns. The curve numbers correspond to the sample numbers from Table 1

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3. Fig. 2. RL spectra of YAG:Ce crystals. The curve numbers correspond to the sample numbers from Table 1

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4. Fig. 3. Dependence of the RL intensity of IAG crystals:Ce at a wavelength of λ = 560 nm of crystals from the concentration of the activator: 1 – crystals grown by the GNC method, 2 – crystals obtained by spontaneous crystallization

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5. Fig. 4. Dependences of the RF intensity at the wavelength λ = 560 nm of the YAG:Ce samples on time. The curve numbers correspond to the sample numbers from Table 1.

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6. Fig. 5. Dependence of the integral contribution of various components of the kinetics of RL of IAG samples:Ce of cerium concentration: 1 – component 68 ns, 2 – component 1090 ns, 3 – intermediate component (190 ns)

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7. Fig. 6. Dependence of the light output of scintillations of IAG crystals:Ce depends on the concentration of the activator: 1 – light output of Ce3+ ions, 2 – light output of the base; a – crystals grown by the GNC method, b – crystals obtained by spontaneous crystallization

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