In this paper, the optical frequency response of gallium nitride-based blue micro-LEDs with different quantum well numbers in the active region is presented. Single quantum well (SQW) blue micro-LEDs have about 1.6 times higher modulation bandwidth (<inline-formula> <tex-math notation="LaTeX">f_{-3\,\text {dB}} </tex-math></inline-formula>) by comparison with triple quantum well blue micro-LEDs. The larger bandwidth enhancement of the SQW micro-LEDs can be attributed to more carriers stored in a quantum well leading to higher recombination rate and lower recombination lifetime. The high <inline-formula> <tex-math notation="LaTeX">f_{-3\,\text {dB}} </tex-math></inline-formula> up to 752 MHz is demonstrated in the SQW micro-LED with a light-emitting area of <inline-formula> <tex-math notation="LaTeX">10\,\,\mu \text {m} \times 10\,\,\mu \text{m} </tex-math></inline-formula>. It suggests that micro-LEDs designed with fewer quantum well numbers may have the potential for the application of visible light communication (VLC) technology.