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Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

Padlyak B.V., Kindrat I.I., Protsiuk V.O. and Drzewiecki A.

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Abstract. We have investigated the optical properties (optical absorption, photoluminescence emission and excitation spectra, and luminescence kinetics) of a series of Eu-doped glasses with the compositions Li2B4O7, CaB4O7 and LiCaBO3. Li2B4O7:Eu, CaB4O7:Eu and LiCaBO3:Eu glasses of high chemical purity and optical quality have been obtained from the corresponding polycrystalline compounds in the air atmosphere, using a standard glass technology. The Eu impurity has been introduced into the borate compounds in the form of Eu2O3 oxide in the amounts of 0.5 and 1.0 mol. %. On the basis of electron paramagnetic resonance and optical spectroscopy data we have shown that the impurity is incorporated into the glass network exclusively as Eu3+ (4f6, 7F0) ions. We have identified all 4f–4f transitions of the Eu3+ centres observed in the optical absorption and luminescence spectra. The most intense emission band of Eu3+ peaked about at 611 nm (the 5D0 → 7F2 transition) is characterized by a single exponential decay, with typical lifetimes that depend on the basic glass composition and the local structure of the luminescence centres Eu3+. The peculiarities of the electron and local structures of the Eu centres in the Li2B4O7, CaB4O7 and LiCaBO3 glasses have been discussed and compared with the reference data for Eu-doped borate single crystals and polycrystalline compounds with the similar chemical compositions, as well as with other borate glasses.

Keywords: borate glasses, Eu3+ centres, optical absorption, luminescence, decay kinetics, local structure of luminescence centres

PACS: 78.55.Qr, 78.55.Qr, 78.20.Ci
UDC: 535.34+535.37+666.22
Ukr. J. Phys. Opt. 15 103-117
doi: 10.3116/16091833/15/3/103/2014
Received: 02.05.2014

Анотація.  Досліджено і проаналізовано оптичні властивості (оптичне поглинання, спектри випромінювання та збудження, а також кінетику люмінесценції) серії зразків боратних стекол Li2B4O7, CaB4O7 і LiCaBO3, легованих Eu. Досліджувані стекла високої хімічної чистоти та оптичної якості зі складами Li2B4O7:Eu, CaB4O7:Eu і LiCaBO3:Eu було отримано з відповідних полікристалічних сполук в атмосфері повітря з використанням стандартної технології скловаріння. Домішку Eu додавали до боратних сполук у вигляді Eu2O3 в кількостях 0,5 і 1,0 мол. %. На основі даних ЕПР і аналізу оптичних спектрів показано, що домішка європію входить у структуру скла зі складами Li2B4O7, CaB4O7 і LiCaBO3 виключно у вигляді йонів Eu3+ (4f6, 7F0). Усі переходи 4f–4f, спостережені для центрів Eu3+ ідентифіковано в спектрах оптичного поглинання та люмінесценції досліджуваних зразків скла. Найінтенсивніша смуги випромінювання йонів Eu3+ із максимумом 611 нм (перехід 5D0 → 7F2 характеризується одноекспоненційною кінетикою загасання з типовими часами життя, які залежать від складу скла і локальної структури центрів люмінесценції Eu3+. Особливості електронної та локальної структури домішкових центрів Eu у склах Li2B4O7, CaB4O7 і LiCaBO3 обговорено в плані порівняння з даними інших робіт для легованих Eu боратних монокристалів, полікристалічних сполук з аналогічними хімічними складами та боратних стекол інших складів.
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