Why can luminous powder store energy

Can persistent luminescent phosphors store light energy in advance?

Nature Materials 22, 289–304 (2023) Cite this article Persistent luminescent phosphors can store light energy in advance and release it with a long-lasting afterglow emission.

What are persistent luminescent materials?

The persistent luminescent materials are a class of photo-luminescent materials. When excited by light irradiation, the persistent luminescent materials absorb light energy and store in the matrix. After the excitation stops, the stored energy will be gradually released in the form of light emission, and this luminescence lifetime can last long.

Which light source is used to charge persistent luminescent phosphors?

As for the pumping source, ultraviolet–visible (UV–Vis) light is the most widely used source to charge persistent luminescent phosphors; however, persistent luminescent phosphors that can be charged with deep-red and even NIR light sources are highly desirable for biological applications.

How long do phosphorescent materials emit light?

Phosphorescent materials continue to emit light up to many hours after the end of external illumination. When all the stored energy is exhausted, the material no longer emits light. Radiative emission derives from the decay of electrons at quantum levels of lower energy.

What happens when a persistent luminescent material is illuminated?

When persistent luminescent materials are illuminated by ultraviolet or sun lights, the 4f 7 electrons in the ground state of Eu 2+ transit to excited-state 4f 6 5d 1.

Are the energy transfer modes in persistent luminescent materials the same?

It is worth to note that it remains to be investigated whether the energy transfer modes are the same in persistent luminescent materials and regular fluorescent materials, since in persistent luminescent materials the defects play an important role in persistent luminescence, and the effects on energy transfer are not reported so far.