抄録
Fluorescence characteristics of gallium nitride powder samples prepared in our laboratory were examined. The samples processed at 1100 °C showed band-edge emission and yellow luminescence, but the samples processed at 900 or 1000 °C showed no significant fluorescence. From the results of XRD analysis, it was confirmed that all these samples had wurtzite gallium nitride structure, and the samples processed at 900 or 1000 °C showed the very low crystallinity. It was suggested that a lot of defects were present in the crystals of these powder samples with low crystallinity, so that the recombination of excited electrons and holes was promoted to show no significant fluorescence emission. In addi- tion, the sample processed with coexistence of activated carbon at a high ratio showed blue light emission around 425 nm, and it was con- cluded that a certain amount of carbon was taken into the crystal lattice.
https://ror.org/00965ax52 
