Rare earth ions doped glasses are very interesting for solid state laser materials. The determines the optical properties of rare earth ions by the 4f electron shell, it is almost insensitive to the surrounding atom of the host environment because of transmission by 5s and 5p electron shells.

The famous one of among rare earth ions is the Dy3+
ion is suitable candidate for analyzing the energy-efficient luminescent
materials 1, 2. Dysprosium rare earth
atoms, Dy which have an active unfilled f shells in its electronic
configuration (Xe 4f104s2), can provide
1.3 ?m emission due to the 6F11/2, 6H9/2?6H15/2
transition 3. In
addition, Dy has a good absorption band at approximately 800 nm, at which level
a cheap commercial laser diode could be used for excitation.

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!

order now

On other hand, the structure of amorphous selenium was
assumed to contain a random mix of selenium chains (Sen) and 8-ring
structures (Se8) distributed randomly throughout the solid.  The filled lone pair (LP) p of
Selenium states forms the bonding (s) band while the empty anti-bonding p states
form anti-bonding (s*) band. The valence band of Se is formed from the lone
pair p electrons and the valence s states of Se lie far below the
top of the valence band 4. During crystallization, the
chains of Sen and Se8 rings transforms into hexagonal and
monoclinic structure in sequence.

The recent Achievements in the growth of chalcogenides doped rare earth ions (RE) studied in last years for active applications of photonic devices such as fiber amplifiers,  biosensors, optoelectronic chips, 3D optical recording, luminescent labels, white light up-conversion emission, color display and the near and mid-IR 5-9, The low phonon energy (


I'm Roxanne!

Would you like to get a custom essay? How about receiving a customized one?

Check it out