Yang Xiao-Gang, Chen Ying-Jun, Yin Pei-Pei, Li Yan, Yang Shu-Yao, Li Yi-Man, Ma Lu-Fang
College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Province Function-Oriented Porous Materials Key Laboratory Luoyang 471934 P. R. China
Chem Sci. 2024 Jul 31;15(35):14202-8. doi: 10.1039/d4sc04228j.
Phosphor-converted white light-emitting diodes (PC-WLEDs) have attracted considerable attention in solid-state lighting and display. However, urgent issues of thermal quenching and high cost remain formidable challenges. Herein, a novel metal-organic framework (MOF) phosphor [CdCl(AD)] was facilely prepared using a mixture of CdCl and acridine (AD) under solvothermal conditions. It shows intensive green emission with a long lifetime of 31.88 ns and quantum yield of 65% while maintaining 95% and 84% of its initial emission intensity after remaining immersed in water for 60 days and being heated to 150 °C, respectively. The low thermal quenching of this MOF material is comparable to or can even exceed that of commercial inorganic phosphors. The combination of experiments and theoretical calculations reveals that the alternating arrangement of delocalized AD π-conjugated systems and CdCl inorganic chains through strong coordination bonds and π⋯π stacking interactions imparts the MOF phosphor with high thermal stability and optoelectronic performance. The successful fabrication of green and white LED devices by coating [CdCl(AD)] and/or N630 red phosphor on a 365/460 nm commercial diode chip suggests a promising and potential alternative to commercial phosphors.
磷光转换白光发光二极管（PC-WLEDs）在固态照明和显示领域引起了广泛关注。然而，热猝灭和高成本等紧迫问题仍然是巨大的挑战。在此，通过在溶剂热条件下使用CdCl和吖啶（AD）的混合物简便地制备了一种新型金属有机框架（MOF）磷光体[CdCl(AD)]。它显示出强烈的绿色发射，寿命长达31.88 ns，量子产率为65%，同时在水中浸泡60天和加热到150°C后，分别保持其初始发射强度的95%和84%。这种MOF材料的低热猝灭性能与商业无机磷光体相当，甚至可以超过它们。实验和理论计算相结合表明，通过强配位键和π⋯π堆积相互作用，离域的AD π共轭体系和CdCl无机链的交替排列赋予了MOF磷光体高的热稳定性和光电性能。通过在365/460 nm商业二极管芯片上涂覆[CdCl(AD)]和/或N630红色磷光体制备绿色和白色LED器件的成功，表明了其作为商业磷光体的一种有前景和潜力的替代品。
