Broadband downconversion based near-infrared quantum cutting via cooperative energy transfer in YNbO4:Bi3+, Yb3+ phosphor

Abstract

YNbO 4 :Bi 3+ , Yb 3+ phosphor was prepared to study the quantum cutting process of converting one ultraviolet photon into two near-infrared photons. An intense nearinfrared emission of Yb 3+ : 2 F 5/2 → 2 F 7/2 around 1 µm was observed under the ultraviolet excitation belonging to the broadband absorption of the [NbO 4 ] 3− group and the Bi 3+ ion. The photoluminescence spectra and decay lifetime measurements indicate efficient energy transfer from Bi 3+ to Yb 3+ ions, which is attributed to be of a cooperative energy transfer mechanism. The YNbO 4 :Bi 3+ , Yb 3+ phosphor with optimized doping concentration may be applicable in improving the efficiency of silicon-based solar cells.

Hydrothermal Synthesis, Luminescence, and Phase Stability of Solid Solution Nanocrystals Based on Y3NbO7 and ZrO2

“…The oxygen vacancy served as the F center, and the electrons trapper greatly affects the luminescent properties in the ZrO 2 . On the other hand, there have been reports on the luminescence of various niobate compounds and on their origins . It has been explained that the blue‐light emission from YNbO 4 is associated with NbO 4 groups from the host crystalline lattice in YNbO 4 phosphor .…”

“…On the other hand, there have been reports on the luminescence of various niobate compounds and on their origins . It has been explained that the blue‐light emission from YNbO 4 is associated with NbO 4 groups from the host crystalline lattice in YNbO 4 phosphor . In the case of Y 3 NbO 7 , it is considered that the blue‐light emission centered at 400 nm is attributed to the niobate octahedral group [NbO 6 ] 7− (self‐trapped exciton recombination luminescence).…”

White luminescence and energy transfer process in Bi3+,Sm3+ co-doped Ca3Al2O6 phosphors

“…In excitation spectra (k em = 488 nm), a broad excitation band ranging from 275 to 325 nm with a maximum at about 300 nm is observed, arising from 1 S 0 ? 3 P 1 transition of Bi 3+ [22]. The excitation spectra and emission spectra present the same tendency with Bi 3+ content.…”

“…Two emission bands are attributed to 3 P 1 ? 1 S 0 transition of Bi 3+ ions [22]. With increasing Bi 3+ concentration, the intensity of the 488 nm emission band increases at first, reaches a maximum at x = 3, and then remarkably decreases when Bi 3+ content is further increased due to concentration quenching.…”

“…Fluorescence of Bi 3+ consists of emission bands originated from 3 P 1 ? 1 S 0 transition [22,23]. Its color varies from ultraviolet to blue and even green in appropriate hosts because that the outer 6s 2 electronic configurations of Bi 3+ depend strongly on their environmental conditions, such as covalence, coordination number and site symmetry [24][25][26].…”