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Luminescence principles 4/orbitals

Initially, the PL mechanism is mainly studied by the molecular orbit theory, and this theory only treats some high-symmetry crystal. For intrinsic PL materials, first-principles calculations are used extensively to discuss the PL origin. From the calculation result, the fundamental crystal information and electronic properties can be obtained. The electronic-transition modes and their allowed or forbidden transition nature can be revealed. Thus, the theoretical results can predict the excitation and emission band positions approximately, which helps to perform the band assignment in the experimental spectra. After knowing the luminescent mechanism, we can modify the luminescence intensify and shift peak position as well as broaden the emission ranges by utilizing various experimental strategies. [Pg.189]

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See also in sourсe #XX -- [ Pg.2 ]



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Luminescence principles

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