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The effect of annealing atmosphere on microstructural and photoluminescence characteristics of multiferroic BiFeO3 (BFO) thin films deposited by pulsed laser deposition (PLD) technique is reported. The films annealed in oxygen environment showed improved microstructure and photoluminescence (PL) characteristics. The PL spectra of oxygen-annealed BFO thin films at room temperature show a strong emission...
Materials exhibiting strong optical emission also exhibit strong absorption at the same wavelengths because both emission and absorption are governed by the same optical dipole and density-of-states. Laser action requires a carrier injection large enough for emission to exceed absorption at laser wavelengths. Thus, strong self-absorption at luminescent wavelengths raises the operating current of LEDs,...
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