Considering that semiconductor photodetectors at transceiver of solar-blind ultraviolet communication （UVC） are insensitive to solar blind band and lower responsiveness， a scheme for receiving ultraviolet communication was proposed based on wavelength down-conversion of fluorescent materials. Using two fluorescent materials developed by our group （Sn-doped silicate fluorescent glass and fluorescent dye polystyrene）， visible light detection in the range of 450-650 nm was realized by LED @270 nm excitation. The results show that compared with the original detection signal of an APD photodetector， the detection response to 270 nm is significantly enhanced when the fluorescent convertor material is attached to the window front of the APD photodetector. For Sn-doped silicate glass， the detector reception response is improved by 1.5 times at 1 kHz. For dye-doped polystyrene， reception sensitivity is increased by 2 times when the modulation rate of the light source is lower than 1.8 MHz. While retaining the advantages of UVC communication， these investigations propose a new research idea and method for improving the detection sensitivity of semiconductor photodetectors.