Novel orange-yellow-green color-tunable Bi³⁺-doped Ba₃Y_4−wLu_wO₉ (0 ≤ w ≤ 4) luminescent materials: site migration and photoluminescence control

Abstract

The site migration of Bi3+ induced orange-yellow-green photoluminescence control in Ba3Y4−wLuwO9 (0 ≤ w ≤ 4).

Self‐Activated Tungstate Phosphor for Near‐Infrared Light‐Emitting Diodes

“…The PLE spectrum monitored at 550 nm consists of three absorption bands with prominent peaks at 257, 320, and 365 nm, which are attributed to the 1 P 1 → 1 S 0 and 3 P 1 → 1 S 0 electron transitions of Bi 3+ ion, respectively. [ 1d,32 ] In addition, the absorption spectrum of the NaLaMgWO 6 host (red curve) overlaps with the emission spectrum of the Bi 3+ ion (green curve), indicating some energy transfer…”

Bismuth‐activated, narrow‐band, cyan garnet phosphor Ca3Y2Ge3O12:Bi3+ for near‐ultraviolet‐pumped white LED application

“…In recent years, researchers have reported many Bi 3+ -activated phosphors, such as YTaO 4 : Bi 3+ , Ca 3 Ga 4 O 9 : Bi 3+ , SrLaZnO 3.5 : Bi 3+ , and Ba 3 Lu 4 O 9 : Bi 3+ . [21][22][23][24] They are mostly used to prepare white LEDs for daily lighting owing to their large full width at half maximum (FWHM) (≥100 nm) and suitable emission position. However, there are few reports about the narrowband, Bi 3+ -activated phosphors needed in WLED for highend display, but we can predict Bi 3+ -activated, narrow-band phosphors through the theories of traditional, narrow-band phosphors activated by rare-earth ions.…”

“…23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref. [ 24 ]. Modeling approaches used in the above work generally involved modeling the flow of a high viscosity resin through porous media and modeling the chemical reactions and volumetric changes during processing.…”

Advances in Near-Infrared Luminescent Materials without Cr3+: Crystal Structure Design, Luminescence Properties, and Applications

“…Usually, the photoluminescence excitation wavelength of Bi 3+ is shorter than those of rare earth Ce 3+ /Eu 2+ ions and mainly in the UV and n-UV region. Considering other types of n s 2 - n sp electron transitions including Pb 2+ , Sn 2+ , and Sb 3+ , the fwhm value generated from n s 2 - n sp electron transition is relatively larger and broader than that of the Ce 3+ /Eu 3+ ions. − Besides, the Stokes shift value of n s 2 - n sp is usually larger than that of 4f-5d transition, and a larger Stokes shift value effectively avoids spectral overlap between photoluminescence excitation and emission spectra . Up until now, many previous studies reported broadband NIR emission of Bi 3+ -activated inorganic luminescent glasses, including bulk glasses, silica glasses, germanate glasses, fluoride glasses, chloride glasses, and chalcogenide glasses. − These reported Bi 3+ -doped luminescent glasses can successfully achieve broadband NIR emission in the region of 800–1600 nm, and fwhm value reaches as high as 600 nm with an IQY value of 32%. − Nevertheless, luminescent glasses still have some drawbacks, for example, low transmittance may largely decrease luminescence quantum yield.…”

“…149−153 Besides, the Stokes shift value of ns 2 -nsp is usually larger than that of 4f-5d transition, and a larger Stokes shift value effectively avoids spectral overlap between photoluminescence excitation and emission spectra. 154 Up until now, many previous studies reported broadband NIR emission of Bi 3+ -activated inorganic luminescent glasses, including bulk glasses, silica glasses, germanate glasses, fluoride glasses, chloride glasses, and chalcogenide glasses. 155−166 These reported Bi 3+ -doped luminescent glasses can successfully achieve broadband NIR emission in the region of 800−1600 nm, and fwhm value reaches as high as 600 nm with an IQY value of 32%.…”