Laser emission from a 1.5-μm wavelength InGaAsP/InP diode was shown to be efficiently converted to visible or to near-infrared light by Er-containing infrared-excitable phosphors. The visible emission has been markedly enhanced in Yb-sensitized phosphors under 0.97-μm wavelength auxiliary light irradiation especially under weak 1.5-μm wavelength excitation. The enhancement mechanism has proved to be Yb-sensitized quantum counter action.
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Yoh Mita (1981) studied this question.
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