Investigation of spectroscopic properties and energy transfer between Ce and Dy in (Lu0.2Gd0.8-x-yCexDyy)(2)SiO5 single crystals
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF LUMINESCENCE
ISSN
0022-2313
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
304-312
Numer tomu
166
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Luminescence and amplification measurements Single crystal Energy transfer
Streszczenia
Język
en
Treść
In this paper we present results of spectroscopic investigations of single crystals with general formula (Lu0.2Gd0.8-x-y)(2)SiO5 codoped with x% of Ce3+ and y% of Dy3+ ions. Investigated materials exhibit strong optical anisotropy what can be easily observed in polarized absorption and emission spectra. Based on room temperature polarized absorption spectra calculations in framework of phenomenological JuddOfelt model was carried out. Intensity parameters Omega(t) were evaluated to be Omega(2)=7.08 (+/-0.39), Omega(4)=2.76 (+/-0.44), and Omega(6)=3.36 (+/-0.21) [10(-20) cm(2)] for sample doped with 1% of cerium and Omega(2)=10.72 (+/-0.33), Omega(4)=1.98 (+/-0.37), and Omega(6)=2.11 (+/-0.18) [10(-2)0 cm(2)] for sample doped with 3% of cerium. Influence of cerium admixture on Judd Ofelt intensity parameters is discussed. Value of experimental lifetime of F-4(9/2) multiplet of Dy3+ ion in sample doped with 1 at% Ce is 0.5 ms (tau(rad)=0.45 ms), while for sample doped with 3 at% of Ce, experimental lifetime is 0.45 ms (tau(rad)=0.43 ms). Absorption bands located cated between 440 and 460 nm, can be utilized for optical pumping of material by GaN laser diodes. Intense and broad emission bands at 465-495 and 560-590 nm, with experimental branching ratio strongly depending on polarization, give high chance for obtaining white luminophore, due to appropiate mixing of blue and yellow luminescence. By means of a pump and probe experiment optical amplification was demonstrated in the codoped sample with 1 at% of Ce and 1 at% Dy at 575 nm corresponding to the emission of Dy3+ with a high net gain coefficient of 34 cm(-1). Such high amplification was obtained under 359 nm excitation (at the maximum of intense absorption band of Ce3+ ions).
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Original article
Original article presents the results of original research or experiment.
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System-identifier
PBN-R:693984
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