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Direct and indirect photoluminescence excitation and ultraviolet emission from Tm-doped
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View: Figures


Image of FIG. 1.
FIG. 1.

PL spectra for of different measured with pulsed excitation at . A logarithmic scale was used to allow the evolution of weak features to be seen more clearly. Transitions are labeled by letters referenced to Fig. 2. The narrow, starred features at 476 and are the second and third order diffractions of the laser light, respectively.

Image of FIG. 2.
FIG. 2.

Energy diagram for , labeling each of the observed PL and PLE transitions. The conduction band states for the materials of different are shown in gray. The wavelengths used typically represent the strongest feature of the multiplet and correspond to a self-consistent assignment of the energy of the levels.

Image of FIG. 3.
FIG. 3.

PLE spectra at for of different . Spectra measured at different are shown by the corresponding colors. The labels indicate the wavelength of the multiplet component measured, which is not always the primary component specified in Fig. 2. The and levels of are indicated by arrows.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct and indirect photoluminescence excitation and ultraviolet emission from Tm-doped AlxGa1−xN