Infrared luminescence of transparent glass ceramic containing Er3+:NaYF4 nanocrystals

Upconversion from fluorophosphate glasses prepared with NaYF4:Er3+,Yb3+ nanocrystals

“…16,17 However, it was found recently, that the crystal growth of NaYF 4 in this glass system is limited by the duration of the heat treatment. Crystal size was reported to be between 9 and 12 nm when heat treating the glass at 560 C. 18 It is known that the structure of the glass has a signicant impact on the crystallization species, crystal size, crystal shapes and the distance among the particles.…”

Monodisperse and core–shell structured NaYF4:Ln@SiO2 (Ln=Yb/Er, Yb/Tm) microspheres: Synthesis and characterization

“…Recently, infrared-to-visible up-conversion phosphors with low optical background, high photo-stability and reduced instrument cost have been the subject of intensively research [31][32][33][34][35][36][37][38][39][40][41][42]. Upconversion phosphors could emit a higher energy photon after absorbing two lower energy excitation photons on the basis of sequential adsorption and energy-transfer steps [43].…”

“…Furthermore, the use of lower energy light is associated with several significant advantages, such as little photodamage to living organisms, high excitation-penetration depths in tissues and the autofluorescence of some biological samples [39,40]. Among all the lanthanide doped up-conversion phosphors, Yb/Er (or Yb/Tm) co-doped NaYF 4 nanocrystals have been reported as the most efficient NIR-tovisible up-conversion fluorescent materials [32][33][34][35][36][37][38], which show strong up-conversion fluorescence seven orders of magnitude higher than that of CdSe-ZnS quantum dots [43,44].…”

Spectroscopic properties and thermal stability of Er3+-doped germanate–borate glasses

“…Rare earth ions doped glasses are very useful materials for infrared and up-conversion lasers, fiber and waveguide lasers and optical amplifiers [1][2][3][4][5][6]. It is well known that the optical properties of rare earth ions depend on the ligand field of host matrix in which the ions are incorporated.…”