摘要
目前,发光材料在信息、显示、照明、国防等领域得到了极其广泛的应用.随着人们对发光和发光材料基本科学问题的认识及其广阔而不可替代的应用前景的驱动,发光和发光材料领域在过去100年间迅速发展.量子效率大于1的发光及光功能材料有望在高效发光、等离子体平板显示、高效光纤激光器、高效太阳能光电池等领域得到广泛应用.深入研究光子材料的激发与发光、能量传递与转换、敏化发光与光放大等物理和光学基本科学问题,不但有益于揭示光子材料的一些新现象、新规律,而且将为光子材料与器件的设计与研制奠定理论和方法基础.本文概述了近红外量子剪裁的发展及其材料和相关机理的最近研究进展,主要包括稀土离子单掺体系双光子和三光子级联发射近红外量子剪裁、稀土离子对共掺体系近红外量子剪裁下转换.此外,本文还讨论了量子剪裁及其材料体系的应用、面临的挑战和未来的发展方向.
Efficient luminescent materials are key requisites for modern lighting and display devices. Typically, they rely on optical down-conversion of incident high-energy radiation to photons of lower energy. Since the energy of a vacuum ultraviolet （VUV） photon is more than twice that of a visible photon, it is theoretically possible to split such a VUV photon into two visible photons, yielding a hypothetic quantum yield （QY） of up to 200%. Such two- （or more） photon luminescence phenomena have been refered to as quantum cutting （QC）, quantum splitting （QS）, or photon cascade emission （PCE）. Near-infrared （NIR） QC via down-conversion phenomena have hence been studied in numerous materials recently, particularly for RE3＋/yb3＋ （RE = Tb, Tm, Pr, Er, Nd and Ho）-codoping. However, in most of those cases where NIR luminescence originates from Yb3~ through a first-order energy transfer from RE3~, QC does actually not occur. Despite the importance of the issue, it appears that there is presently no report on NIR- QS （especially three-photon NIR-QS） in a single-ion activated material. As a consequence, the main mechanisms responsible for NIR-QS not well understood. The present paper reviews on the recent progress made on materials and developments in the fields of NIR-QC phosphors and the mechanism involved, including the observation of sequential two-photon and three-photon NIR-QS in single RE ion activated phosphors, and NIR-QC in dual/ternary RE ions activated phosphors via downconversion. In addition, applications, challenge and future advances of the QC phosphors have also been dealt with.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2013年第11期1431-1456,共26页
SCIENTIA SINICA Chimica
基金
国家自然科学基金重点项目(U0934001)
国家杰出青年科学基金(51125005)资助
关键词
发光
量子剪裁
下转换
近红外发光
稀土离子
luminescence, quantum splitting, downconversion, near-infrared, rare-earth ions
