Acoustic-stimulated relaxation of GaAs₁₋хPх LEDs electroluminescence intensity

The effect of ultrasonic (US) treatment on electroluminescence of initial and irradiated with 2-MeV electrons (Φ = 8.24·10¹⁴ e/cm²) GaAs-GaP LEDs grown on solid solution base was studied. It was found that luminescence intensity of samples previously loaded with US increased during long-term storage (t = 15 h). Passing the current through the diode generates the relaxation process of radiation brightness falling followed by the growth when ultrasound is switched on. The results of calculation of the dislocation density responsible for electroluminescence quenching within the region of electroluminescence degradation are adduced. It was found the ultrasound effect on diodes irradiated with high-energy electrons

Anisotropy of ultrasonic waves propagation velocities in CdHgTe/CdTe

The complete set of elastic moduli of Cd₀.₂Hg₀.₈Te was obtained. Taking into account elastic moduli found for Cd₀.₂Hg₀.₈Te and appropriate literary data for CdTe the anisotropy of velocities of volume and Rayleigh waves propagating on (100) and (110) boundaries was calculated. Finally, peculiarities of the anisotropy of SAW propagating velocities for each of components of layered structures CdHgTe/CdTe and for the heteroepitaxial structure as a whole were analysed

Ultrasound influence on exciton emission of GaP light diodes

Electroluminescence of GaP light diodes, treated by ultrasound at room and low temperatures has been studied. It has been found that short ultrasound caused improvement of red diode emission characteristics while electroluminescence degradation occurred in structures treated by prolong treatment at room temperature. Spectral curves measured under acoustic dynamic mode possess some specific features concerning fine structure. If reverse biased diodes possess microplasma initially, ultrasound action decreases its brightness. Possible mechanisms of the ultrasonic interaction with crystal structure defects have been discussed