infrared emission
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2022 ◽  
Corentin Grimaldi ◽  
Sean McGuire ◽  
Christophe O. Laux

T. Zhezhera ◽  
P. Gluchowski ◽  
M. Nowicki ◽  
M. Chrunik ◽  
A. Majchrowski ◽  

Abstract An efficient near-infrared quantum cutting process by cooperative down-conversion of active Bi3+ and Nd3+ ions was demonstrated in Bi3TeBO9:Nd3+ phosphors. In particular, the near-infrared emission of Nd3+ ions enhanced by Bi3+ ions of a series of novel Bi3TeBO9:Nd3+ microcrystalline powders doped with Nd3+ ions in various concentrations was investigated. In order to investigate the luminescent properties of BTBO:Nd3+ powders, the excitation and emission spectra and the fluorescence decay time were measured and analyzed. In particular, the emission of Bi3TeBO9:Nd3+ at 890 and 1064 nm was excited at 327 nm (via energy transfer from Bi3+ ions) and at 586.4 nm (directly by Nd3+ ions). The highest intensity emission bands in near-infrared were detected in the spectra of Bi3TeBO9:Nd3+ doped with 5.0 and 0.5 at.% of Nd3+ ions upon excitation in ultraviolet and visible spectral range, respectively. The fluorescence decay lifetime monitored at 1064 nm for Bi3TeBO9:Nd3+ powders shows the single- or double-exponential character depending on the concentrations of Nd3+ ions. The possible mechanisms of energy relaxation after excitation Bi3TeBO9:Nd3+ powders in ultraviolet or visible spectral range were discussed. The investigated Bi3TeBO9:Nd3+ phosphors efficiently concentrate the ultraviolet/visible radiation in the near-infrared spectral range and can be potentially used as effective spectral converters. Graphical abstract

2022 ◽  
Vol 20 (2) ◽  
pp. 021603
Wei Wang ◽  
Qinpeng Chen ◽  
Yifei Zhao ◽  
Yakun Le ◽  
Shengda Ye ◽  

2022 ◽  
Vol 123 ◽  
pp. 111896
Xiaoqin Yang ◽  
Youming Zhang ◽  
Liqin Cao ◽  
Minghui Shao ◽  
Jiamin Cao ◽  

Yoshiaki Nishijima ◽  
Shinya Morimoto ◽  
Armandas Balcytis ◽  
Tomoki Hashizume ◽  
Ryosuke Matsubara ◽  

We demonstrate extraordinarily spectrally selective narrowband mid-infrared radiation absorbance and thermal emittance with resonant peak FWHM < 124nm at λ = 5.73 μm, corresponding to a Q-factor of ~ 92.3....

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