3,3-Diphenyl-9,10-di-n-undecyloxypyrano[3,2-a]phenazine3was designed to be incorporated into fibres of 2,3-di-n-undecyloxyphenazine which display gel-forming ability in various fluids. A spectrokinetic study and the determination of the temperatures of gel-to-sol phase transition, give evidence of the insertion of the photochromic chromene into the organogelator network. Under continuous irradiation, the photochromic reaction induces a decrease of the gel strength which can be used to trigger the gel-to-sol phase transition.