Tuning the efficient blue/red afterglow in a luminescent plastic film

Light quality, especially of red and blue light, has been considered a crucial concern which dictates numerous adaptive responses and determines the developmental transitions in plants. During the research, one easy and efficient strategy is demonstrated to replenish red and blue light for extended durations through a luminescent plastic film, which is prepared using a composite luminescent material (Sr2MgSi2O7:Eu2+, Dy3+/light conversion agent). This composite material refers to certain type of long afterglow luminescent material fabricated using a combination of a light conversion agent and Sr2MgSi2O7:Eu2+, Dy3+ with the given mass ratio. Sr2MgSi2O7:Eu2+, Dy3+, when excited under UV light and near-UV light for a short time, can emit blue light for more than eight hours. It also serves as kind of blue persistent luminescence donor phosphor. In addition, the light conversion agent has been applied in tuning blue light to red light partially as the red conversion phosphor. The red/blue light ratio can be controlled by varying the doping content of the light conversion agent and Sr2MgSi2O7:Eu2+, Dy3+ taking into account the different needs of plants.