Photoluminescence and spectral holeburning in europium-doped MgS nanoparticles.
Luminescence and power-gated spectral holeburning studies have been performed on Eu-doped MgS nanoparticles. These particles are atomically tailored to produce and control the relative concentration of Eu(2+) and Eu(3+), which is necessary for power-gated holeburning. The spectral holes are permanent at low temperatures. Optical studies show that the electron-phonon coupling is stronger in nanoparticles than in thin films or microparticles of the same material. This is the reason for inherently broader spectral holes in nanoparticles as compared to microparticle or thin-film samples. Temperature broadening of spectral holes in nanoparticles follows a T(2.4) behavior, a faster rate than thin films or microparticles. This behavior can be attributed to the glassy nature of the particles produced.
Hasan
Zameer
Z
Physics Department, Temple University, Philadelphia, Pennsylvania 19122, USA. zhasan@temple.edu
Dardona
Sameh
S
Konjhodzic
Aras
A