At low temperatures lower luminous intensity

Captured by the trap level ( in the course of the external excitation light source , electron transitions from the ground state to the excited state (process 1 ) , a part of the electronic transitions back to a low energy level of Eu2 + to produce a light decorative aggregate ( Process 2 ) , through another portion of the electronic relaxation 3 ) . When electrons are stored in the trap energy absorption and re- excited by the excited state back , then transitions to the ground state and light is emitted . When the low temperature trap level is not conducive to the electron from the fluorescent paint  back to the excitation , the emission intensity is low at low temperatures , when the ambient temperature is increased in favor of traps electrons excited by the excitation back , so the higher the temperature emission intensity .