Abstract: Light is an electronicmagnific radiation in the range of violet to infrared.Luminescence is light radiation except thermal radiation.Luminescence is the theoretical fundation for design luminescent materials and its applications.In this work，based on Bohr hypothesis，energy levels and transition of isolated atom in vacuum and inantivacuum are analysized and the luminescent mechanism is induced.Quantum cutting and up-conversion lumines cence of non-isolated atoms are investigated by energy transfer of atom at excited state.And it is found that the atomic excieted state energy transfer is a key for understanding luminescence.The students follow the advance of lumines cent physics by introducing Nobel prize that is relative with luminescence.We get overstep from fundament knowl edge to science border in the college physics.

Key words: energy levels, transition, energy transfer of atom at excited state, upconversion luminescence, quantum cutting luminescence