Luminescence Dependence of Pr³⁺ Activated SiO₂ Nanophosphor on Pr³⁺ Concentration, Temperature, and ZnO Incorporation

Infrared to infrared upconversion emission in Pr3+/Yb3+ co-doped La2O3 and La(OH)3 nano-phosphors: A comparative study

“…1 G 4 electronic transitions, respectively. Pr 3+ is generally known for its emission in blue region [12][13][14]23], however, Pr 3+ doped in several hosts emits strong green, red and broad infrared emissions [12,13,[16][17][18][19]23]. In our case, we also observe sharp green, red and broad infrared emissions, respectively.…”

“…Most of the earlier work based on upconversion process report a conversion of infrared light to visible or visible to ultraviolet (UV) light [12][13][14][15][16][17][18]. Only in few reports the upconversion in infrared to infrared regions have been observed [12,16,19]. Infrared to infrared upconversion emission have been studied by the several workers [20][21][22].…”

“…The Pr 3+ ion has distinguished features of transitions in blue [12][13][14]16,23,24], green [12,13,17,18,23], red [4,12,15,25,26] and infrared regions [12,16,19], which are strongly host dependent. In fact, Pr 3+ ion is known for its strong blue emission but in special cases strong green, red and infrared emissions have also been observed.…”

“…Normally smaller the phonon frequency of host material larger will be the upconversion emission intensity. The luminescence spectrum of Pr 3+ ion has been reported by different worker in various hosts [12][13][14][15][16][17][18][19][23][24][25][26][27][28][29]. Thus, Choi et al have reported the luminescence properties of SrTiO 3 :Pr 3+ , Al 3+ phosphor prepared by glycolate method and compared the photoluminescence efficiency of this with the same phosphor prepared using other synthesis routes [15].…”

Structural, optical and antibacterial activity studies of neodymium doped ZnO nanoparticles

“…This may be generated due to electronic transition from an interstitial Zn to a Zn vacancy [34]. Two peaks near 490 and 520 nm correspond to the green emission are clearly visible in various percentages of Nd doped ZnO, normally originates from the single occupied oxygen vacancies or zinc interstitials because of the antisite oxygen which is induced as a result of the lattice distortion caused by incorporation of larger ionic radius of Nd ions in the ZnO lattice [35]. According to previous reports, the Fig.…”