为稀土穿上“能量转换外衣” 中国科学家取得研究新突破|两根双龙玩弄尿喷h肉4p图片
1. 双龙头by
中新社北京11月20日电 (记者 曾玥)记者20日从清华大学获悉，该校深圳国际研究生院副教授韩三阳团队与黑龙江大学教授许辉、韩春苗团队和新加坡国立大学教授刘小钢团队联合发表最新研究成果，为稀土纳米晶设计并穿上“能量转换外衣”，使能量可高效传递给稀土纳米晶的有机分子界面，在解决电致发光器件的研究和应用难题方面取得新突破。
当日，上述研究成果以“捕获电生激子实现可调谐的稀土纳米晶电致发光”为题，在线发表于国际学术期刊《自然》(Nature)。
稀土纳米晶具有发光颜色可调、发光谱线窄、发光稳定性高等先天优势，通过调控纳米晶内部掺杂离子组分可使该材料体系实现广色域的多色发光，故被认为是电致发光材料的“潜力股”。然而稀土材料的绝缘特性使电流难以注入其中并实现传输，因此，稀土纳米晶也被称为发光材料中的“绝缘宝石”，这一“电流驱动”的瓶颈阻碍了稀土材料在现代光电技术中的研究和应用。
针对上述难题，韩三阳团队与许辉、韩春苗团队和刘小钢团队联合攻关，创新性地通过表面修饰为稀土纳米晶穿上“能量转换外衣”，采用有机—无机杂化策略精确调控能级结构，借助配体工程将激子能量高效分配给镧系离子发光体，成功解决了电致发光中激子产生、输运和注入的核心难题，实现了高色纯度、光谱可调的高效电致发光。
“这项成果的意义在于，我们不仅让稀土材料‘通上了电’，更打开了其在现代光电技术中应用的大门。”韩三阳介绍，多个实验结果显示，该成果在多种波段电致发光方面具备潜力，特别是在高分辨率、宽色域显示以及近红外技术中，无需大幅改动器件结构，仅通过调控稀土离子即可实现多色发光。
据悉，这项成果不仅将推动稀土发光在柔性显示、近红外器件等领域的应用，未来还有望进一步应用到人体健康监测、无创检测以及开拓农作物补光技术等场景中。(完)
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