Abstract: An invisible light emitting device includes a thermal radiation emitting component and a light converting component. The thermal radiation emitting component is configured to provide first invisible light and thermal energy. The light converting component covers a light emitting surface of the thermal radiation emitting component. The light converting component includes a first light transmission body and light converting material disposed in the first light transmission body. The light converting material is configured to provide second invisible light by absorbing the first invisible light and thermal energy from the thermal radiation emitting component. The invisible light emitting device can rapidly provide the second invisible light and has a longer lifetime. In addition, the radiation intensity distribution of the invisible light emitting device can be controlled by adjusting optical design of the first light transmission body.