Abstract: Glow-in-the-dark rigid and flexible polymeric thermoplastic sheets or films, and methods of making the same are provided. Specifically, the sheets or films may include a reflective backing that provides directional luminescence. In addition, the sheets or films may include a flame-retarded resin and/or flame retardant additive. Moreover, the sheets or films may include a protective topcoat to protect the phosphorescent sheets or films from abrasive materials, moisture, oils, and/or acidic or alkaline materials. The sheets or films of the present invention may further have adhesive materials disposed on a surface of the phosphorescent sheets or films for adhering the sheets or films to surfaces. The sheets or films of may further be printable without requiring pretreatment of the sheets or films. In addition, the sheets or films may be laser markable.