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    面向世界科技前沿,面向国家重大需求,面向国民经济主战场,率先实现科学技术跨越发展,率先建成国家创新人才高地,率先建成国家高水平科技智库,率先建设国际一流科研机构。

    ——中国科学院办院方针

    首页 > 每日科学

    人造“夜明珠”材料取得新突破

    2019-09-30 光明日报 张亚雄 张哲浩
    【字体:

    语音播报

      记者近日从西北工业大学获悉,该校柔性电子研究院科研团队在有机长余辉发光领域再次取得突破性进展??蒲型哦由杓撇⒖⒘艘幌盗行滦途酆衔锍び嗷圆牧?,相关成果已在线发表于国际学术期刊《自然·通讯》上。

      据悉,长余辉发光是指发光材料在撤去激发光源后,仍能持续发光数秒至数小时的一种发光现象。被古代帝王奉为稀世珍宝的“夜明珠”,因含有长余辉发光材料,即使处于黑暗之中也能发出夺目的光芒。长余辉发光材料被广泛应用于夜间应急指示、仪表显示、光电子器件以及国防军事等领域。近年来,更是备受防伪、加密及生物成像等前沿科学领域的青睐。

      科研团队带头人、论文通讯作者、中国科学院院士黄维表示,近几年,有机长余辉材料得到了快速发展,然而这类材料主要集中在晶体小分子和主客体掺杂体系。由于晶体小分子体系的结晶性和主客体掺杂体系的相分离等问题限制了材料的实际应用,因此,如何实现聚合物材料的长余辉发光成为这一领域的一大挑战。

      针对这一难题,科研团队提出通过离子键锁定发光单元,在聚合物共价键的协同作用下,实现离子型聚合物的长余辉发光,其发射寿命长达2.1秒。此外,科研团队还首次报道了激发波长依赖的聚合物长余辉发光现象,实现了余辉颜色从蓝色到橙色的可调。并且在温度高达170℃的情况下,这类材料依然保持可视化长余辉发光??翁庵饕瓿扇税仓诟=淌诒硎?,这一研究成果赋予了传统聚合物材料以新的性能,加之材料来源广、成本低,将使其在柔性显示、照明、数据加密及生物医学等领域具有更广阔的应用前景。

    打印 责任编辑:侯茜
    • 成功一半靠运气
    • 我国科学家首创新型柔性电子“印刷术”

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