Simultaneous observation of quenched wide-gap semiconductor crystals has been observed using single- and two-photon
luminescence. It is was found at the quenched area, single-photon excitation gives luminescence read-out compared to
two-photon which no luminescence detected at the bandgap wavelength. This is due to transition of electron between the
bandgap in the two-photon luminescence to occur have been demolished by the quenching which involved two-photon
quenching process. Furthermore, side lobes that exist in the longer part of the luminescence spectrum are resulted by
decreasing in the Stark effect which increased the transition energy. The dependency if excitation power with the
observed from the crystal's luminescence is elaborated which confirmed the single- and two-photon luminescence
methods.
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