Luminescence enhancement and color regulation of Sr2LiAlO4-1.5N : Eu2+ phosphor for high color rendering index white LED applications
Year: 2025
Type: article
Abstract: The color rendering index (CRI) of white light-emitting diodes (LEDs) is very important for lighting quality. Currently, high-CRI white LEDs are typically fabricated by combining multiple-color phosphors. Therefore, the realization of multipeak-emission phosphors in a single phosphor is valuable. The Sr 2 LiAlO 4 : Eu 2+ phosphor exhibits an obvious double-peak emission in the yellow-green spectral range and has excellent luminescence properties , suggesting its potential application in white LEDs. In this study, a series of Sr 2 LiAlO 4-1.5 x N x : Eu 2+ ( x = 0–0.7) phosphors were successfully synthesized by introducing N 3− ions to replace O 2− ions. The luminescence intensity was significantly enhanced by increasing the N 3− concentration. Upon reaching a concentration of 0.7, the intensity of the yellow emission exceeded that of the green emission, indicating a shift in emission color from green to yellow. The emission peak of the Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ phosphor is at 568 nm, which exhibited broader yellow light emission. Finally, Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ was fabricated with a CaAlSiN 3 : Eu 2+ red phosphor on 450 nm blue LED chips. The fabricated white LEDs was observed to be white light with a high CRI of 92.1 and an adjustable color temperature (4938-6665k), showing its potential application in white LEDs.
Source: Journal of Solid State Chemistry
Institution: China Jiliang University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,540
Award: G4416799665
OpenAlex ID: W4408265850