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Color‐Tunable Blue to Green Ca4‐1.5xTa2O9: xTb3+ Phosphor: Cross‐Relaxation Mechanism and Thermal Stability

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Color‐tunable Ca4‐1.5x Ta2O9: xTb3+ phosphors are prepared via a convenient solid‐state reaction and the cross‐relaxation mechanism is investigated. The concentration of Tb3+ ions greatly affects blue‐green emission in Ca4Ta2O9 samples. The cross‐relaxation effect is explained with the use of Raman and emission spectra and the thermal stability of Ca4‐1.5x Ta2O9: xTb3+ is evaluated under excitation at 254 nm. Using the theoretical fitting results, the cross‐relaxation between Tb3+ ions, via energy transfer from 5D3 to 5D4, was determined to be a multipolar interaction of the dipole–dipole mechanism. The critical distance was calculated to be 15.45 Å. The thermal quenching temperature (T 50) is higher than 200°C. Results show that Ca4‐1.5x Ta2O9: xTb3+ phosphors have good thermal stability and color tunability.
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Document Type: Research Article

Publication date: 2012-05-01

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