Passive　daytime　radiative　cooling　(PDRC)　presents　an　effective　strategy　for　mitigating　the　global　greenhouse　effect.　However,　some　existing　PDRC　systems　necessitate　complex　designs　and　are　limited　to　selectively　radiate　heat　into　outer　space.　To　improve　the　performance　of　PDRC　systems,　we　have　developed　a　multifunctional　rare　earth　phosphor　film　that　integrates　particle　scattering,　fluorescence　emission　and　broadband　radiation　capabilities.　Outdoor　tests　conducted　under　an　average　solar　radiation　of　644　W　m-2　indicated　that　the　film　achieved　a　sub-ambient　cooling　temperature　of　8.26　degrees　C　with　a　net　cooling　power　reaching　up　to　101　W　m-2.　During　night　tests,　the　SM　film＇s　average　cooling　was　only　0.29　degrees　C,　which　is　promising　for　real-life　nighttime　comfort　and　building　service　life.　Given　its　superior　performance　and　multifunctionality,　the　composite　film　demonstrates　significant　potential　for　application　in　contemporary　green　development　initiatives.