Luminescence properties of reduced SrO–Al2O3–GeO2 glasses

Structural and nano-composite features of TiO2–Al2O3 powders prepared by sol–gel method

“…Alumina has numerous applications ranging from catalysis [5,6] to optics [7], electronics [8] and biomedicine [9,10]. Alumina and titania have been used interchangeably for many applications and each has individual drawbacks.…”

Three primary colors emitting from Er3+–Eu3+ co-doped oxygen-deficient glasses

“…It has been reported that the GODCs has two PL bands at 300 and 395 nm with the corresponding excitation bands at 250 and 330 nm [27]. Then, the blue emission band centered at 402 nm might attribute to T 1 → S 0 transition of GODCs [21,29].…”

Synthesizing Ag+: MgS, Ag+: Nb2S5, Sm3+: Y2S3, Sm3+:Er2S3, and Sm3+:ZrS2 Compound Nanoparticles for Multicolor Fluorescence Imaging of Biotissues

“…One may consider that the nature of the fluorescence can be explained by considering the energy transferring from molecular groups to specific metal ions and then the decays of electrons from high energy levels to low energy levels. − However, these metal ions contained in our samples (e.g. Ag + , Mg 2+ , S 2– , Nb 5+ , Y 3+ , and Zr 4+ ) do not seem optically active given that they are typically not showing optical energy levels.…”

“…The orange/red luminescence on the other hand has been attributed to metal ions impurities, which are Mg 2+ , Nb 5+ , Y 3+ , Er 3+ , and Zr 4+ in the samples. It has also been theoretically proposed that the internal decay of antisite defects could give rise to the red luminescence. − …”

“…Here, the electron directly populates the conduction band. The core-hole is filled by the atomic-like Ag or Sm d electrons essentially, whose vacancy can subsequently decay via the interaction with a valence band electron. − …”