Luminescence properties and its red shift of blue-emitting phosphor Na₃YSi₃O₉:Ce³⁺for UV LED

Abstract

phosphors, which may contribute to future research in designing novel solid phosphors by modifying composition of the host lattice to affect crystal field splitting and centroid shift, and then adjusting emission wavelengths to match the purposed application.

High‐Pressure High‐Temperature Synthesis of Mixed Nitridosilicatephosphates and Luminescence of AESiP3N7:Eu2+ (AE=Sr, Ba)

“…Materials properties concerning solid‐state lighting can be tuned by dopant concentration to a limited extent, affecting Stokes shifts in emission spectra, or by a variation of the size of coordination polyhedra by substitution such as introducing Sr on Ba sites. Completely shifted emission properties, however, can only be achieved by a fundamental alteration of the host lattice [5, 6] …”

The influence of codoping on optical properties and glass connectivity of silica fiber preforms

“…In the case of crystalline materials, it has been reported that the distortion of Ce 3+ sites affects the crystal field splitting of the 5d configuration, and that the occurrence of vacancies might contribute in changing Ce charge distribution. Consequently, both would lead to red shift emission and changes in band symmetry [33][34][35] The Raman spectra of silicate glasses can be divided in different major regions, and we will consider two of them: the high and the low-frequency regions. The low-wavenumber region from ~ 350 to 650 cm -1 , gives information on the T-O-T rocking, bending mode and ring distributions (see [36] and references therein).…”

Ce3+/Eu2+ Doped Al2O3 Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Photoluminescence Enhancement by Ce3+→Eu2+ Energy Transfer

“…The PL excitation and emission spectra of Ce 3+ and Eu 2+ singly doped Al2O3 coatings are presented in Figure 4. The PL excitation spectrum of Al2O3:Ce 3+ coating (Figure 4a) exhibited the broad band in the range from 250 to 340 nm and peaked at about 285 nm, corresponding to the direct excitation from the Ce 3+ ground state 4f to the field-splitting levels of 5d state [20]. The For further investigation of the chemical nature and oxidation state of Ce and Eu in created coatings, we recorded a high-resolution Ce 3d and Eu 3d core-level spectra of Ce and Eu doped Al 2 O 3 coating created in supporting electrolyte with the addition of 4 g/L CeO 2 + 4 g/L Eu 2 O 3 particles ( Figure 3).…”

“…The PL excitation and emission spectra of Ce 3+ and Eu 2+ singly doped Al2O3 coatings are presented in Figure 4. The PL excitation spectrum of Al2O3:Ce 3+ coating (Figure 4a) exhibited the broad band in the range from 250 to 340 nm and peaked at about 285 nm, corresponding to the direct excitation from the Ce 3+ ground state 4f to the field-splitting levels of 5d state [20]. The…”

“…The PL excitation and emission spectra of Ce 3+ and Eu 2+ singly doped Al 2 O 3 coatings are presented in Figure 4. The PL excitation spectrum of Al 2 O 3 :Ce 3+ coating (Figure 4a) exhibited the broad band in the range from 250 to 340 nm and peaked at about 285 nm, corresponding to the direct excitation from the Ce 3+ ground state 4f to the field-splitting levels of 5d state [20]. The corresponding PL emission spectrum excited at 285 nm shows one broad emission band peaked at about 340 nm, attributed to the transitions of 5d excited state to the 2 F 7/2 and 2 F 5/2 ground states [20].…”