Abstract
Very intense green and red emission was observed at room temperature from the and levels of . A cw diode laser at 975 nm was used as a pump for resonant sequential excitation of the and levels. The fluorescence was easily visible to the naked eye, even with 27 mW of excitation power. It was found that at 850 mW
of cw excitation power the total luminance was . This corresponds to of green emission and of red emission.
© 2000 Optical Society of America
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