Up-conversion emission in rare earth-doped Y2Ti2O7 sol–gel thin films

Solvothermal synthesis and tailored upconversion emission of monodisperse ultrasmall face-centered cubic Sr2YF7 nanocrystals

“…Then [34,35], but two-photon process for Er 3+ /Yb 3+ codoped nanocrystals. In our experiment, the mechanism to realize the 523 nm emission that we suppose is different from other's reports [33,34]. In addition, the ultraviolet emission is hardly detected in tri-doped Sr 2 YF 7 nanocrystals, which means that ET from Tm 3+ to Er 3+ occurs.…”

“…6 which has indicated the possible UC mechanisms to produce the tailored-color UC emission. For Yb 3+ has much bigger absorption section than Er 3+ or Tm 3+ under the excitation of the 980 nm laser, high efficient UC processes of Er 3+ /Yb 3+ or Tm 3+ /Yb 3+ codoped Sr 2 YF 7 nanocrystals are mainly originated from the sensitization of Yb 3+ ions [33]. As shown in Fig.…”

A new vision of photodarkening in Yb³⁺-doped fibers

“…Four distinct emission bands are observed across the spectral range; each of these bands is normalized to its maximum in the figure. All bands at 300 nm, 360 nm, 475 nm and 650 nm can be attributed to the presence of Tm 3+ ions according to the spectroscopy database (see for example [12,13] Despite the high purity of the raw doping material (N48) used to manufacture the Yb sample, the presence of thulium contamination even in very small quantities (210 ppbw) still produces a significant light emission. The blue emission has also been attributed to thulium by Jetschke et al [18] and it can be also clearly identified in [19][20].…”

Solvothermal synthesis of monodisperse ultrasmall cubic-structure Ba2YbF7 nanocrystals with intense upconversion

“…As shown in Fig For Yb 3+ has much bigger absorption section than Er 3+ or Tm 3+ under the excitation of the 980 nm laser, high efficient upconversion processes of Er 3+ or Tm 3+ doped Ba 2 YbF 7 nanocrystals are originated from the sensitization of Yb 3+ ions [31]. Fig.…”