Electronic Structures and Luminescence Properties of YNbO4 and YNbO4:Bi

Hybrid precursors synthesis and optical properties of LnNbO4:Bi3+ blue phosphors and Bi3+ sensitizing of on Dy3+'s luminescence in YNbO4 matrix

“…Obviously this is a Bi effect that influences the optical properties of the niobate group. It was reported that the HOMO has more O 2p character than Bi 6s character in LnNbO 4 and the introduction of Bi ion in the LnNbO 4 will distort the structure stronger [20,27]. So the charge transfer from O 2p to Bi 6p can occur easily in LnNbO 4 :Bi 3+ , which was responsible for the band at 300 nm in LnNbO 4 :Bi 3+ .…”

“…Usually, the emission spectra of Bi 3+ ions presents a structureless broad band and the peak position of the band varies from the UV region into the red region with differing host lattice, which depend on these factors, such as covalency, coordination number, site symmetry and network rigidity [14][15][16][17]. Rare earth niobates are efficient hosts for Bi 3+ known as self-activated luminescent materials and YNbO 4 :Bi 3+ phosphor particles have been synthesized by Lee et al, whose luminescent nature has been investigated using the calculated partial density of states in the framework of density functional theory [18][19][20].…”

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

“…The Bi 6s6p is located at a lower energy level than that of Nb 4d. The calculated partial densities of states show that the Bi 6s 2 valence band levels lie just above the O 2p valence band levels and the Bi 6s 2 levels overlap with the O 2p ones [29,32]. Thus, the electron in O 2p (Bi 6s 2 ) can be excited to Nb 4d and Bi 6s6p.…”

“…Compared with the undoped YNbO 4 , the blue photon emitted from YNbO 4 :Bi 3+ matches much better the energies of two Yb 3+ : 2 F 7/2 → 2 F 5/2 transitions, making the CET from one Bi 3+ to two Yb 3+ theoretically possible and potentially more efficient. Besides, the doping of the Bi 3+ ion extends the absorption band due to the superposition of the charge transfer of [NbO 4 ] 3− and the Bi 3+ : 6s 2 → 6s6p electric-dipoleallowed transition [31,32]. The broader absorption band in the UV part leads to better utilization of the solar spectrum.…”

Novel YNbO4:RE3+ (RE=Sm, Dy, Er) microcrystalline phosphors: Chemical co-precipitation synthesis from hybrid precursor and photoluminescent properties

“…YNbO ceramics to obtain the high roughness [30][31][32][33] and some reports were reported on the crystal characterization [34][35][36]. Besides, YNbO 4 :Bi 3+ has been verified to be potential blue phosphors for cathodluminescence [37][38][39][40]. While for the photoluminescent properties for YNbO 4 activated by rare earth ions has rarely been reported except for Eu 3+ enters [41].…”