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High quantum efficiency and excellent color purity of red-emitting Eu(3+)-heavily doped Gd(BO(2))(3)-Y(3)BO(6)-GdBO(3) phosphors for NUV-pumped WLED applications

Eu(3+)-doped phosphors have been much attractive owing to their narrow-band red emission peak at 610–630 nm with high color purity; however, the weak and narrow absorption band in the NUV region limits their applications. Doping a higher amount of Eu(3+) ions into a non-concentration quenching host...

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Detalles Bibliográficos
Autores principales: Tran, Manh Trung, Van Quang, Nguyen, Huyen, Nguyen Thi, Tu, Nguyen, Van Du, Nguyen, Trung, Do Quang, Tuan, Nguyen Tri, Hung, Nguyen Duy, Viet, Dao Xuan, Tung, Duong Thanh, Trung Kien, Nguyen Duc, Hao Tam, Tong Thi, Huy, Pham Thanh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10443187/
https://www.ncbi.nlm.nih.gov/pubmed/37614782
http://dx.doi.org/10.1039/d3ra03955b
Descripción
Sumario:Eu(3+)-doped phosphors have been much attractive owing to their narrow-band red emission peak at 610–630 nm with high color purity; however, the weak and narrow absorption band in the NUV region limits their applications. Doping a higher amount of Eu(3+) ions into a non-concentration quenching host could be key to enhancing the efficiency of the absorption value and emission intensity. Hence, the design of Eu(3+)-heavily doped phosphors with a suitable host lattice is key for applications. In this study, red-emitting Eu(3+)-doped Gd(BO(2))(3)-Y(3)BO(6)-GdBO(3) (GdYGd:Eu(3+)) phosphor with a high quantum efficiency of 58.4% and excellent color purity of 99.5% is reported for the first time. The phosphor is efficiently excited by NUV light at 394 nm and emits a strong red emission band in the 590–710 nm range, peaking at 612 nm. The optimal annealing temperature and Eu(3+) doping content to obtain the strongest PL intensity are 1100 °C and 20 mol%, respectively. The optimized GdYGd:Eu(3+) phosphor possesses a high activation energy of 0.319 eV and a lifetime of 1.14 ms. An illustration of phosphor-coated NUV LED with chromaticity coordinates (x = 0.5636,y = 0.2961) was successfully synthesized, demonstrating the great potential of GdYGd:Eu(3+) phosphor for NUV-pumped WLED applications.