Method for measuring thermal conductivity of thin film based on fluorescent micro-nano-particles

The invention provides a method for measuring thermal conductivity of a thin film based on fluorescent micro-nano-particles. The method comprises providing fluorescent micro-nano-particles, heating the fluorescent micro-nano-particles, ensuring a temperature coefficient through measuring the relationship between PL spectrum (photoluminescence spectra) characteristic peak displacement of the fluorescent micro-nano-particles and temperature change, placing a film to be detected on a substrate, placing a heat-absorbing resource and the fluorescent micro-nano-particles on the surface of the film to be detected, wherein the fluorescent micro-nano-particles are used as temperature sensors, irradiating the film to be detected through laser, ensuring a relationship slope by measuring the relationship between the PL spectrum characteristic peak displacement of the fluorescent micro-nano-particles and the laser power change, and measuring thermal conductivity of the film through combination of an optical power absorpti