{"title":"Constructing Organic Phosphorescent Scintillators with Enhanced Triplet Exciton Utilization Through Multi‐Mode Radioluminescence for Efficient X‐Ray Imaging","authors":"Huanhuan Li, Yitong Liu, Wei Zhao, Hengyu Cao, Xin Yan, Shuman Zhang, Xi Yan, Hui Li, Ye Tao, Gaozhan Xie, Wei Li, Runfeng Chen, Wei Huang","doi":"10.1002/adma.202409338","DOIUrl":null,"url":null,"abstract":"The development of organic phosphorescent scintillators with high exciton utilization efficiency has attracted significant attention but remains a difficult challenge because of the inherent spin‐forbidden feature of X‐ray‐induced triplet excitons. Herein, a design strategy is proposed to develop organic phosphorescent scintillators through thermally activated exciton release to convert stabilized spin‐forbidden triplet excitons to spin‐allowed singlet excitons, which enables singlet exciton‐dominated multi‐mode emission simultaneously from the lowest singlet, triplet, and stabilized triplet states. The resultant scintillators demonstrate a maximum photoluminescence efficiency of 65.8% and a minimum X‐ray radiation detection limit of 110 nGy s<jats:sup>−1</jats:sup>; this allows efficient radiography imaging with a spatial resolution of ≈10.0 lp mm<jats:sup>−1</jats:sup>. This study advances the fundamental understanding of exciton dynamics under X‐ray excitation, significantly broadening the practical use of phosphorescent materials for safety‐critical industries and medical diagnostics.","PeriodicalId":114,"journal":{"name":"Advanced Materials","volume":null,"pages":null},"PeriodicalIF":27.4000,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/adma.202409338","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The development of organic phosphorescent scintillators with high exciton utilization efficiency has attracted significant attention but remains a difficult challenge because of the inherent spin‐forbidden feature of X‐ray‐induced triplet excitons. Herein, a design strategy is proposed to develop organic phosphorescent scintillators through thermally activated exciton release to convert stabilized spin‐forbidden triplet excitons to spin‐allowed singlet excitons, which enables singlet exciton‐dominated multi‐mode emission simultaneously from the lowest singlet, triplet, and stabilized triplet states. The resultant scintillators demonstrate a maximum photoluminescence efficiency of 65.8% and a minimum X‐ray radiation detection limit of 110 nGy s−1; this allows efficient radiography imaging with a spatial resolution of ≈10.0 lp mm−1. This study advances the fundamental understanding of exciton dynamics under X‐ray excitation, significantly broadening the practical use of phosphorescent materials for safety‐critical industries and medical diagnostics.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.