Abstract
AbstractNaGd(WO4)2: Eu3+ phosphors by using sodium citrate (Na3Cit, Na3C6H5O7) as chelating agent were synthesized via hydrothermal method. The structure and morphology were characterized and analyzed by the X‐ray diffraction and field emission scanning electron microscopy. Adding Na3Cit into the reaction solution can considerably influence the crystallite morphologies of the samples. The temperature dependent photoluminescence spectra of NaGd(WO4)2: Eu3+ phosphors with different ratios of Cit3−/Re3+ have been measured. It was found that, in the NaGd(WO4)2: Eu3+ phosphors, the optical temperature sensing can be achieved by following three temperature dependent parameters: the ratio of luminous intensity of thermally coupled energy levels (5D0 and 5D1); the emission intensities of Eu3+ 5D0‐7F2 transition; the Huang‐Rhys factor of Eu3+ 7F0‐5D2 transition absorption. And the temperature sensing sensitivities of all three methods increased with increase of the ratios of Cit3−/Re3+. This is mainly due to that the number of crystal defects increases with increase of the concentration of Cit3−, and the vibration modes and number of phonons increase, so the intensity of electron‐phonon coupling increases.
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