{"title":"Ce3+,Cr3+ co-doped garnet phosphors with yellow and near-infrared emission for white and near-IR dual-mode pc-LEDs","authors":"Qipeng Wu \n (, ), Jiali Tang \n (, ), Yue Han \n (, ), Shuzhen Liao \n (, ), Xinguo Zhang \n (, ), Shixun Lian \n (, ), Jilin Zhang \n (, )","doi":"10.1007/s40843-024-3116-8","DOIUrl":null,"url":null,"abstract":"<div><p>Cr<sup>3+</sup>-activated phosphors with adjustable near-infrared (NIR) emission have attracted considerable attention due to their diverse applications across various fields. While modifying the emission wavelength of Cr<sup>3+</sup> can be achieved by adjusting its coordination environment, the parity-forbidden d-d transition presents a challenge by limiting absorption and resulting in a low external quantum efficiency (EQE) in Cr<sup>3+</sup>-doped phosphors. Moreover, longer emission wavelengths often coincide with reduced thermal stability. To address these issues, energy transfer from a sensitizer to Cr<sup>3+</sup> has been proposed as a strategy to enhance both EQE and thermal stability of NIR emission. The selection of an appropriate host structure is crucial. In this study, a garnet structure, Ca<sub>2</sub>LuMgScSi<sub>3</sub>O<sub>12</sub>, was identified as a promising candidate for achieving efficient broadband NIR emission under blue light excitation. Specifically, Ca<sub>2</sub>LuMgScSi<sub>3</sub>O<sub>12</sub>:Ce<sup>3+</sup> exhibited a yellow emission with exceptional internal quantum efficiency and EQE of up to 94.6% and 64.8%, respectively. By leveraging efficient energy transfer from Ce<sup>3+</sup> to Cr<sup>3+</sup>, the Ca<sub>2</sub>LuMgScSi<sub>3</sub>-O<sub>12</sub>:Ce<sup>3+</sup>,Cr<sup>3+</sup> phosphors exhibited tunable yellow to NIR emission. Notable, the highest EQE recorded for Ca<sub>2</sub>LuMgScSi<sub>3</sub>O<sub>12</sub>:Ce<sup>3+</sup>,Cr<sup>3+</sup> was 56.9%, significantly surpassing that of the Cr<sup>3+</sup> single-doped counterpart. Furthermore, the co-doped phosphor demonstrated thermal stability comparable to that of Ce<sup>3+</sup> single-doped phosphor. Of particular significance, the developed prototype pc-LED emitted a combination of broadband white and NIR light, demonstrating potential applications in solar-like lighting, food analysis, and biomedical imaging.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":773,"journal":{"name":"Science China Materials","volume":"67 12","pages":"3932 - 3940"},"PeriodicalIF":6.8000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s40843-024-3116-8","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Cr3+-activated phosphors with adjustable near-infrared (NIR) emission have attracted considerable attention due to their diverse applications across various fields. While modifying the emission wavelength of Cr3+ can be achieved by adjusting its coordination environment, the parity-forbidden d-d transition presents a challenge by limiting absorption and resulting in a low external quantum efficiency (EQE) in Cr3+-doped phosphors. Moreover, longer emission wavelengths often coincide with reduced thermal stability. To address these issues, energy transfer from a sensitizer to Cr3+ has been proposed as a strategy to enhance both EQE and thermal stability of NIR emission. The selection of an appropriate host structure is crucial. In this study, a garnet structure, Ca2LuMgScSi3O12, was identified as a promising candidate for achieving efficient broadband NIR emission under blue light excitation. Specifically, Ca2LuMgScSi3O12:Ce3+ exhibited a yellow emission with exceptional internal quantum efficiency and EQE of up to 94.6% and 64.8%, respectively. By leveraging efficient energy transfer from Ce3+ to Cr3+, the Ca2LuMgScSi3-O12:Ce3+,Cr3+ phosphors exhibited tunable yellow to NIR emission. Notable, the highest EQE recorded for Ca2LuMgScSi3O12:Ce3+,Cr3+ was 56.9%, significantly surpassing that of the Cr3+ single-doped counterpart. Furthermore, the co-doped phosphor demonstrated thermal stability comparable to that of Ce3+ single-doped phosphor. Of particular significance, the developed prototype pc-LED emitted a combination of broadband white and NIR light, demonstrating potential applications in solar-like lighting, food analysis, and biomedical imaging.
期刊介绍:
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.