Lifetimes of Lanthanide(III) Triboluminescence Excited by Aerodynamic Shock Waves
Lifetimes of Lanthanide(III) Triboluminescence Excited by Aerodynamic Shock Waves
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气动冲击波激发的镧系元素（III）摩擦发光的寿命
DOI：
10.1021/acs.jpcc.9b08349
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hasegawa Yasuchika
中科院分区：
文献类型：
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作者：
Hirai Yuichi;Kotani Akira;Sakaue Hirotaka;Kitagawa Yuichi;Hasegawa Yasuchika
摩擦发光（TL）自17世纪世纪以来就已被人们所知，并在各种固态材料中被观察到，但由于与光致发光（PL）相比，获得定量物理信息的途径有限，其基本机制仍未阐明。为了使用一般的物理参数确定TL和PL之间的差异，我们使用空气动力学冲击波作为脉冲机械力来估计镧系元素（III）配位聚合物[Ln（hfa）3（dpf）]n（Ln = Eu、Tb或其混合物; hfa =六氟乙酰丙酮; dpf = 2，5-双（二苯基磷酰基）呋喃）的TL寿命（τTL）。有趣的是，Tb（III）/Eu（III）混合化合物的Tb（III）中心的τ TL显示出与Tb（III）纯化合物的τ TL略有不同，这与先前观察到的Tb（III）离子的绿色发射在TL中比在PL中更占主导地位相一致。结果表明，研磨条件下Tb（III）-to-Eu（III）的激发能转移减少。
Triboluminescence (TL) has been known since the 17th century and is observed in various solid-state materials, but the fundamental mechanisms have still not been elucidated due to the limited access to quantitative photophysical information compared to that for photoluminescence (PL). With the aim of determining the difference between TL and PL using general photophysical parameters, we used aerodynamic shock waves as pulsed mechanical forces to estimate the TL lifetimes (τTL) of lanthanide(III) coordination polymers [Ln(hfa)3(dpf)]n(Ln = Eu, Tb, or mixture thereof; hfa = hexafluoroacetylacetonate; dpf = 2,5-bis(diphenylphosphoryl)furan). Interestingly, the Tb(III)-centered τTLof Tb(III)/Eu(III) mixed compounds showed a slight difference from that of a Tb(III) pure compound, being in agreement with a previous observation that the green emission from Tb(III) ions was more dominant in TL than in PL. The results strongly indicated that Tb(III)-to-Eu(III) excited energy transfer was reduced under the condition of grinding.