A deep-red-emitting Bi3+/Mn4+-doped CaLi6La2Nb2O12 phosphor: Luminescence and energy transfer properties. (April 2020)

• Record Type: Journal Article
• Authors: Huang, Dayu; Dang, Peipei; Wei, Yi; Bai, Biao; Lian, Hongzhou; Zeng, Qingguang; Lin, Jun
• Is Part Of: Materials research bulletin. Volume 124(2020)
• Publication Date: 2020-04
• Subjects: LED -- Phosphors -- Red emission -- Energy transfer -- Color tuning; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2019.110743
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: A deep-red-emitting Mn 4+ -doped CaLi6 La2 Nb2 O12 was investigated and Bi 3+ -Mn 4+ energy transfer was designed to achieve blue-to-red emission color tuning. Highlights: The CaLi6 La2 Nb2 O12 :Bi3 +, Mn 4+ phosphors were synthesized for the first time. Bi3+/Mn4+ co-doped CaLi6La2Nb2O12 phosphors have high energy transfer efficiency. The Bi 3+ /Mn 4+ energy transfer was designed to achieve emission color tuning from bule to red, and enhanced red emisison of Mn 4+ ion. Abstract: Recently, much attention has been attracted on the optical properties based on the phosphors for LED light. A near Ultraviolet (n-UV) and blue chip activated phosphor of CaLi6 La2 Nb2 O12 :Bi 3+, Mn 4+ is synthesized by a traditional SSR method. Phase purity and lattice structure of the crystal have been confirmed and investigated by XRD, Rietveld refinement, FE-SEM and TEM. The luminescence performances of the series phosphors are investigated by diffuse reflection spectra (DR), Raman scattering spectra, steady-state PL spectra and the measurement of lifetime., the CaLi6 La2 Nb2 O12 :Bi 3+, Mn 4+ exhibits emission peaked at ∼466 and ∼711 nm Under excited at 312 nm. The Dq, B and C are calculated to estimate the nephelauxetic effect of Mn 4+ in [NbO6 ] octahedral lattice. The coordinate shifting could be controllable through the energy transfer Bi 3+ →Mn 4+, which can be verified by PL spectra and decay lifetimes. Finally, by coating the blend of red CaLi6 La2 Nb2 O12 :0.03Bi 3+, 0.015 Mn 4+ and Y3 Al5 O12 :Ce 3+ (YAG:Ce 3+ ) phosphors onto the blue LED chip, a LED device with good performances ( x = 0.36, y = 0.36, CRI = 86.6, CCT =4220 K) can be achieved. Hence, CaLi6 La2 Nb2 O12 :Bi 3+, Mn 4+ is a good material of red emission.