A metal-to-metal charge transfer induced green-yellow phosphor CsAlGe₂O₆:Bi³⁺ for full-spectrum LED devices

Abstract

MMCT-induced Bi3+-activated green-yellow phosphors suitable for full-spectrum LEDs.

Unraveling the origin of broadband yellow emission in Bi3+-doped LuXnGaO4 (Xn = Mg, Zn) phosphors

“…[1][2][3][4][5][6][7][8] Like Eu 2+ and Ce 3+ , the luminescence of Bi 3+ originates from radiative transitions of its outermost electrons. Consequently, its luminescence properties are highly dependent on the coordination environment, which results in it exhibiting a diverse range of colorful emissions within the visible light spectrum, including blue light in CaLaGa 3 O 7 :Bi 3+ , 9 cyan light in Ba 2 ZnGe 2 O 7 :Bi 3+ , 10 green light in La 3 SbO 7 :Bi 3+ , 11 yellow light in Ba 2 LuGaO 5 :Bi 3+ , 12 red light in La 4 GeO 8 :Bi 3+ , 13 and nearinfrared light in Y 2 Ti 2 O 7 :Bi 3+ . 14 Compared to Eu 2+ and Ce 3+ , the uniqueness of Bi 3+ is manifested in three aspects: firstly, Bi 3+ belongs to the transition metal ion group and is costeffective; secondly, the excitation spectrum of Bi 3+ lies in the ultraviolet (UV) and near ultraviolet (NUV) bands without the reabsorption effect; and thirdly, the luminescence of Bi 3+ can be generated by intra-ionic or extra-ionic electronic transitions with significant differences in luminescence characteristics.…”