Wydział Chemii

A. Baran

Sebastian Mahlik

Marek Grinberg

Eugeniusz Zych

2013

Journal of Physics-Condensed Matter

25

025603/1-025603/10

10.1088/0953-8984/25/2/025603

Naukowa

Angielski

Artykuł

Tricalcium diyttrium trisilicon oxide, Ca₃Y₂(SiO₄)₃ doped with Eu²⁺ and Eu³⁺ belongs to a very limited number of hosts able to accommodate both Eu³⁺ and Eu²⁺ ions, which might make it useful for white light emitting diodes (WLEDs) based on UV chip technology. In this contribution we present a detailed study of photoluminescence kinetics and high pressure spectroscopy of Eu³⁺ and Eu²⁺ doped Ca₃Y₂(SiO₄)₃. At ambient pressure and room temperature, under excitation with near-UV radiation, a broad emission band from 400 to 550 nm due to the 4f⁶5d¹→4f⁷(⁸S_7/2) transition in Eu²⁺ was observed, as well as several emission peaks in the region between 550 and 710 nm, ascribed to the ⁵D₀→ ⁷F_J (J = 0–4) transitions in Eu³⁺. The bluish green luminescence related to Eu²⁺ in the Ca₃Y₂(SiO₄)₃ exhibits a small red pressure-induced shift reaching −5.2 cm⁻¹/kbar. The red shifts of the luminescence lines related to Eu³⁺ ion emission vary from 0.15 to −0.54 cm⁻¹/kbar. Time-resolved photoluminescence was measured at different temperatures and pressures. Luminescence decay traces were studied for the bluish green emission band of Eu²⁺ and for the red emission peak due to the ⁵D₀ → ⁷F₂ transition of Eu³⁺. Decay times slightly decreased with increasing pressure.

http://dx.doi.org/10.1088/0953-8984/25/2/025603

https://ioppublishing.org/