| With the rapid development of information processing, submarine communications, high-density data storage, color display, detection, particularly in the field of laser medical, There is a growing urgent need for high efficiency, low cost, high-performance short-wavelength laser source, especially blue-green wavelength laser. Therefore, looking for laser material in this band is a major issue in the field of materials research. Because of its profuse energy-level and can be easily excited to higher energy-level sensitized by other rare earth ions, Tm3+ ion is one of the most attractive active ions which are applied to upconversion luminescence. As a result of its strong blue and green emission, Tm3+ ions doped in glasses, crystals and nanomaterials have been a research focus recently.Up-conversion luminescence mechanism and research status were summarized in this article. For low phonon energy, low toxicity and easy preparation of the matrix materials, Tm3+/Yb3+ co-doped alkali lanthanum gallate glasses (12Na2O-23La2O3-65Ga2O3) was prepared. The optical properties of this sample were investigated under an excitation from a commercially available 980nm laser diode. Blue (478 nm), red (651 nm) and near infrared (NIR) emission bands were observed which were corresponding to the transitions of 1G4→3H6,1G4→3F4 and 3H4→3H4 of Tm3+ ions, respectively. The upconversion intensity dependence of excitation power and possible upconversion mechanism were evaluated.
|
PDF Full Text Request