Luminescence of Localized Excitons and Exciton Induced Luminescence in Alkali Halides

Excitons and Radiation Damage in Alkali Halides

The quantum mechanical description of atomic spectra was the beginning of a new era of quantum physics which today is the theoretical basis of nuclear and solid state physics, chemistry, and biochemistry [1,2]. Quantum mechanics opened also a new look to solid state physics which will be illustrated by the development of the conception of excitons [3]. One of the basic quantum mechanical proble...

Luminescence of singlet self-trapped excitons in MgF(2).

Fast (τ∼1.7 ns) broadband (full width at half-maximum = 1.1 eV) vacuum ultraviolet (VUV; hν = 8.4 eV) luminescence from MgF(2) crystals has been detected at low temperature (T<80 K) and analyzed with techniques of cathodoluminescence and time-resolved VUV spectroscopy using synchrotron radiation. The VUV emission discovered has been attributed to the luminescence of spin-singlet self-trapped ex...

Exciton luminescence in AIN triggered by hydrogen and thermal annealing

Bound exciton luminescence in shock compressed GaP:S and GaP:N

Photoluminescence PL spectra of bound excitons were measured in uniaxially strained GaP by performing shock-wave experiments at liquid nitrogen temperatures. GaP samples doped with sulfur or nitrogen were compressed up to 3 GPa when subjected to uniaxial strains along the 100 crystallographic orientation. PL lines from shallow sulfur donors redshifted upon compression, tracking the reduction in...

Anomalous transport and luminescence of indirect excitons in AlAs/GaAs coupled quantum wells as evidence for exciton condensation

Due to the long lifetime of indirect ~interwell! excitons, exciton condensation ~analogous to the BoseEinstein condensation of bosons! is expected to occur in coupled quantum wells ~CQW’s!. The critical conditions for the exciton condensation have been predicted to be strongly improved by high magnetic field perpendicular to the well plane. We present results of experimental study of transport ...