Abstract
We provide experimental evidence for direct and indirect excitations of photoluminescence (PL) from Tm-doped AlxGa1−xN of varying Al content. Direct excitation of Tm3+ ions is observed primarily at 85K through transitions H63→I61, P03, P13, and P23 when these levels are below the absorption edge of the AlxGa1−xN for a given Al content. Strong ultraviolet emission at 298nm (I61→H63), 355nm (I61→F43), and 371nm (D21→H63), as well as the familiar blue emission at 463nm (D21→F43), and 479nm (G41→H63), is found to depend sensitively on the Al content, excitation wavelength (i.e., direct or indirect), excitation type (continuous wave versus pulsed), and upper state of the transition. PL excitation spectroscopy and time-integrated and time-resolved PL spectra are compared to elucidate the complex energy transfer pathways.
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