Abstract
To evaluate of light extraction efficiency and structural properties, Eu3+ doped TiO2 sphere were prepared by means of solvothermal reaction method. The influence of Eu3+ concentration on the size and surface morphology of TiO2 spheres were examined by taking the scanning electron microscope and transmission electron microscope images. When the Eu3+ ion was introduced in anatase phase, the intense red emission of 612.5nm was observed under the excitation at 392.5nm. The emission intensity increased with increasing the concentration of Eu3+ ions. Moreover, the diffused reflectance spectra of Eu3+ doped TiO2 spheres exhibited higher reflectivity by high concentration of Eu3+ ions. When the blue LED chip is coated with a combination 10mol% Eu3+ doped TiO2 spheres and commercial Y3Al5O12:Ce3+ phosphor, a pleasant WLED with a high intensity, a CRI of 62 and a CCT of 4938k, which are enhanced light extraction efficiency, is achieved.
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