Light emission of flame-generated TiO2 nanoparticles: Effect of IR laser irradiation

•Measurements of light emission of titania nanoparticles in flame spray apparatus heated by low-energy IR laser pulses.•Detection of the behavior of temperature of particles with and without laser irradiation versus laser fluence (starting from very low values of laser fluence).•Investigation of the behavior of the Urbach energy of titania nanoparticles affected by IR laser.•Evauation of the refractive index of the irradiated titania nanoparticles at the excitation wavelength.