Improved luminescence and high thermal stability in translucent SrBaSiO4 ceramic disc for high power LED

SrBaSiO4:Eu2+ is one of the most used green emitters for phosphor-converted light-emitting diodes (pcLEDs), but moderated luminous efficacy has been reported to date under UV excitation. Since the elimination of light scattering from power excitation is favorable to increase the light interaction with active ions, translucent fluorine-doped (SrBaSiO4:Eu2+, F-) ceramic discs with high luminous efficacy were fabri-cated herein through the solid-state reaction method. This orthosilicate exhibits broad and efficient ex-citation in the blue region and promotes the shift of the maximum excitation band to a larger wavelength (from 378 to 393 nm). Fluorine-doped and undoped samples show typical green emissions centered at 524 and 522 nm, respectively. The reported ceramic discs show a 12% improved emission compared to phos-phors in powder form, which resulted from a reduced thermal quenching. Phase identification and crystal structure were studied using a standard X-ray diffraction technique to explain the possible influence of fluorine ions on the spectroscopic properties. A phosphor remote configuration device was constructed using a 405 nm UV LED chip to demonstrate the performance of SrBaSiO4:Eu2+,F- ceramic phosphor discs, leading to an impressive luminous efficacy (LE) of 103 lm/W. The LE is one of the highest values reported for green light-emitting SrBaSiO4:Eu2+,F- phosphor, showing enormous potential for energy saving and the development of healthy lighting devices.(c) 2023 Elsevier B.V. All rights reserved.