Abstract
Phosphors are the essential parts of modern lighting devices. It generally consists of host materials and embedded luminescence center, on which light conversion from short to long wavelength occurs. The luminescence process originates from the transitions between ground and excited energy levels of the luminescent center. It also depends on the crystal structure of host materials. However, the local coordination structure may deviate from the average structure, leading to complex structure-property relationships. In this chapter, we provide a detailed review of the local structure and luminescence tuning in phosphors. The basic theory and concepts of local structure and luminescence from d–f transitions of lanthanide ions are briefly introduced. Then the luminescence tuning caused by local structure regarding some representative phosphors, such as Y3Al5O12:Ce3+, (Ba,Sr,Ca)2SiO4:Eu2+ and (Ca,Sr)AlSiN3:Eu2+, is presented. We summarize the relationships among the local structure, crystal-field splitting, preferential occupancy, the degree of ordering, split-atom-site and optimal bonding, local structure evolution, remote control of neighboring cation, cation-size-mismatch, chemical substitution/co-substitution and luminescence tuning including thermal quenching properties. The main aim is to provide a deeper understanding of luminescent properties from the viewpoint of local structure.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call