报告题目：LED it Be

报  告 人：Andries Meijerink院士（荷兰乌得勒支大学）

报告时间：2024年12月4日10:00-12:00

报告地点：北区科技园1号楼W301会议室

报告摘要：

The invention of the blue LED has profoundly changed the lighting market. The future is LED lighting. The first success in creating a white light LED relied on YAG:Ce3+, a well-known phosphor that turned out to tick all the boxes to survive the extreme conditions (high temperature and light flux) experienced by phosphors in LEDs. To improve the performance of white light LEDs in efficiency, colour rendering and color gamut for displays, many new lanthanide-based phosphors were found such as CASN:Eu2+ but also 3d transition metal based phosphors, for example KSF:Mn4+.

In this presentation recent developments in LED phosphor research will be discussed. Many challenges remain, both in developing better phosphors for new applications and understanding issues as quenching, defects, high power effects, stability, alternative ions. Some ‘hot’ areas of research include human centric lighting, plant centric lighting (horticulture), narrow band phosphors for high color gamut/efficiency, micro LED phosphors, nanophosphors and high power LEDs and saturation issues. Recent work in our group related to these issues/applications will be discussed followed by an outlook.

报告人简介：

Andries Meijerink received his MSc and PhD degree in Chemistry at Utrecht University. After a post-doc in Madison (University of Wisconsin) he returned to Utrecht in 1991. In 1996, at the age of 32, he was appointed at the chair of Solid State Chemistry in the Debye Institute of Utrecht University where he leads an active group in the field of luminescence spectroscopy of quantum dots and lanthanide ions. In the field of lanthanide ions his work involves fundamental research on the energy level structure of both 4fn and 4fn-15d states, energy transfer and finding new concepts related to applications in solar cells, LEDs and scintillators. His research on quantum dots is aimed at unravelling the influence of quantum confinement and surface effects on the electronic structure and exciton dynamics of quantum dots through optical spectroscopy and using the quantum dots as labels in bio-imaging. Research on luminescence of doped nanocrystals integrates the two themes.