Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7839668 | Journal of Luminescence | 2018 | 8 Pages |
Abstract
A series of novel red-emitting phosphor of Li5La3-3xEu3xTi2O12 (xâ¯=â¯0.01-0.25) were synthesized via the facile solid-state reaction method. The Rietveld refinements verified that all the samples crystallized in a garnet-like cubic structure. The band gap energy of Li5La3Ta2O12 is 3.87â¯eV, which can be greatly narrowed by Eu3+-doping. This benefits the red-shift of optical absorption from UV- to near-UV light region. Importantly, the sample presents dominant absorption in near-UV (390-395â¯nm) and blue-light (460-465â¯nm) region. Li5La3-3xEu3xTa2O12 (xâ¯=â¯0.01-0.15) has a bright red-luminescence with the strongest 5D0 â 7F2 transition at 613â¯nm. The energy transfer was discussed on the Eu3+-doping concentration. The experimental red-emitting lamps were fabricated using a 395 and a 460â¯nm LED-chips, respectively, in combination with the single phosphor of Li5La3-3xEu3xTa2O12 (xâ¯=â¯0.2) driven by 2â¯mA current. The results indicate that the phosphor could be a promising candidate used in solid-state lightings and displays.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Suyin Zhang, Pengyue Zhang, Xin Liu, Zhexi Yang, Yanlin Huang, Hyo Jin Seo,