Triboluminescence of A New Europate Complex

A new europium (Ⅲ)complex Eu(HFNH)3Phen (HFNH: 4, 4, 5, 5, 6, 6, 6-heptafluoro-l-(2-naphthyl)hexane-1,3-dione ; phen : 1, 10-phenanthroline) was synthesized and its tribolumineseent phenomenon was observed. Photoluminescence and tfiboluminescence spectra were successfidly determined. The most intense tfiboluminescent emission originates from the transition of the central Eu^3 ion from ^5D0 level to ^7F2 level. The tribolunlinescent spectrum is basically similar to that of photoluminescence, which correlates with the disorders of F atoms.     

Electron and photon emission accompanying the abrasion of MgO with diamond

We report simultaneous, time-resolved measurements of photon emission, electron emission, and frictional force during the abrasion of single crystal MgO with a diamond stylus in vacuum. We present evidence for the luminescence being primarily due to deformation and the electron emission being primarily due to fracture. Time-resolved measurements of all three signals show strong fluctuations which reflect stick-slip-like behavior. These measurements indicate enhanced deformation activity at the beginning of a stick event, with predominant fracture activity beginning some milliseconds later. These emissions provide insight into the processes responsible for catastrophic failure of ceramics in wear applications.     

Discovering and Dissecting Mechanically Excited Luminescence of Mn2+ Activators via Matrix Microstructure Evolution

Mechanoluminescent (ML) materials featuring renewable mechanical-to-optical conversion have shown promising prospects in stress sensing, lighting, and display. However, the advancement in ML applications is being restrained by the obstacles in developing efficient ML materials and understanding the underlying ML mechanisms. Herein, a matrix evolution strategy to modulate the local microstructure and electronic environment around the luminescent activators is proposed, which not only supports the batch development of new ML materials but also provides a well-connected platform for systematically revealing the mechanism of achieving efficient ML performance. The feasibility of the strategy is proved by constructing and evaluating a series of ML materials with matrix-dependent luminescent properties in experimental-theoretical collaboration. It is demonstrated that the construction of piezoluminescence is available in both non-centrosymmetric and centrosymmetric matrices without being restricted by lattice symmetry. The inter-electronic-levels and shallow electron traps formed by activator doping enhance the electron recombination efficiency through tunneling and conduction band transfer pathways. The results are expected to accelerate the exploitation of ML material systems and to deepen the comprehensive apprehending of ML mechanisms, thereby guiding the rational design and widespread use of efficient ML materials.     

摩擦发光探测装置研制

为进一步研究固体材料在机械压力作用下产生的发光现象及机制,自行研制一套摩擦发光探测装置。该装置由机械系统、控制系统和测量系统三部分组成,可实现不同转速、不同载荷、不同摩擦副下的摩擦发光光强和光谱的探测。通过测量不同转速、不同载荷以及不同摩擦副下的摩擦发光实验,发现重复多次测量,实验结果数据稳定且有一定规律性,证明了摩擦发光探测装置的可行性。     

稀土(铕、铽)三元配合物的合成、表征与发光性能

合成了Eu(TFA)3(TPPO)2、Tb(TFA)3(TPPO)2三元配合物以及Eu1／2Tb1／2(TFA)3(TPPO)2三元双核配合物，并经元素分析、紫外-可见吸收光谱和红外透射光谱确认。研究了配合物的发光性质,发现了该三元体系配合物的摩擦发光现象,且三元双核配合物经摩擦发出明亮的白光。     

A versatile low-cost laboratory apparatus for testing triboluminescent materials

The design and fabrication of a simple low-cost laboratory apparatus used to test triboluminescent properties of materials is reported. This unique experimental system consists of an impact chamber attached to the bottom of an adjustable drop tower. A 1.25 in. steel ball with a mass of 130 g is dropped from a known height in the tower impacting the pile of powdered triboluminescent sample at low velocities (<10 ms⁻¹). Any generated triboluminescence is then recorded using a photodiode and amplifier and recorded on an oscilloscope. The resulting triboluminescence data is analyzed using specially written LabVIEW programs. The details of the experimental setup, techniques, and results for several common inorganic and organic triboluminescent phosphors are discussed in this paper.     

廉价萤石不可能是夜明珠

文章首先回顾中国学术界和传媒将萤石球当作夜明珠的观点以及对萤石球的追捧热潮，然后追溯李约瑟简单提出夜明珠为萤石的观点及其在中国的传播，接着探讨古代夜明珠的基本物性及判别标准，提出判别夜明珠的五条准则：1)夜间自然有光的原则，2)自然产出的原则，3)自然的珠状形态原则，4)十分稀有的原则和5)非凡价值的原则，最后大篇幅分条目陈述廉价萤石不可能是夜明珠的学术论辩理由。