Irradiate the luminous object (the strongest dedicated UV lamp or fluorescent lamp) with strong light for about 5- 10 minutes. Turn off the lights. Don't turn on the flash because the mobile phone has an automatic function to take pictures. ) moving luminous objects to shoot in weak yellowish light (such as reading desk lamps, which will light up at least when turned on). Then the luminous effect will be very good. Actually, you can shoot directly in the dark.

Then there is the luminous intensity of your luminous object.