Effect of the CTAB concentration on the upconversion emission of ZrO2:Er3+ nanocrystals

Luminescence properties of ytterbium and erbium doped silica–zirconia nanostructured optical fiber under near infrared excitation

“…6 show a development of the visible emission bands as a function of the pump power, the green emission always being more intense than the red one in this case. The split emission band [515-577 nm] is related to the radiative transitions 4 S 3/2 -4 I 15/2 and 2 H 11/2 -4 I 15/2 , which is explained by an upconversion process in erbium ions, enhanced by the low phonon energy of the zirconia nanocrystals [13], as previously demonstrated by Patra et al [14,15] and de la Rosa-Cruz et al [16] in erbium doped bulk or powdered zirconia xerogels. These mechanisms are described by the energy diagram in Fig.…”

VOx/γ‐Al2O3 Catalysts for Propane Dehydrogenation Prepared by “Impregnation‐Solid Phase Reaction” Method with Aluminum Hydroxide as Support Precursor

“…Besides, no peaks related to the crystalline phases of V 2 O 5 are detected, suggesting a good dispersion of VO X species. In general, the particles smaller than 3 nm is hard to be detected by XRD …”

Improving pure red upconversion emission of Co-doped Y2O3:Yb3+–Er3+ nanocrystals with a combination of sodium sulfide and surfactant Pluronic-F127

“…The number of photons involved in the upconversion process was investigated by analyzing the dependence of the upconverted signal intensity (I upc ) as function of the pumping intensity (I pump ). It is well-known that this dependence is expressed by the equation I upc ¼kI n pump where n denotes the number of photons absorbed to produce such upconverted emission [50,51]. Fig.…”