Erasing the Glow in the Dark: Controlling the Trap and Release of Electrons in Phosphorescent Materials,Journal of Chemical Education

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Erasing the Glow in the Dark: Controlling the Trap and Release of Electrons in Phosphorescent Materials
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1021/acs.jchemed.7b00744
William A. Getz ₁ , Dannielle A. Wentzel ₁ , Max J. Palmer ₁ , Dean J. Campbell ₁

Affiliation

Common phosphors found in readily available glow-in-the-dark products include transition-metal-doped zinc sulfide and transition-metal-doped strontium aluminate compounds. Phosphorescence of these materials is initiated by light with energies that are specific to each phosphor composition. In many cases, the phosphorescence of these materials can also be darkened by further excitation with light that has lower energy than the minimum energy required to produce the initial glow. The visible darkening of the phosphor material produces an effect akin to an “off switch” or “eraser” for the emitted light. The light excitation to produce the phosphorescence and the darkening can be produced by either coherent or noncoherent light sources with the proper energies and intensities. Phosphor darkening caused by low-energy light can be used in visually remarkable chemistry demonstrations. Additionally, since the distributions of electrons in the low- and high-energy states in these phosphors can be controlled and changed by using various wavelengths of light, they can be used to illustrate concepts associated with steady-state distributions of species and reaction kinetics, as well as applications that utilize controlled release of phosphorescence.

中文翻译：

消除黑暗中的光辉：控制磷光材料中电子的陷阱和释放

在容易获得的夜光产品中发现的常见磷光体包括掺杂过渡金属的硫化锌和掺杂过渡金属的铝酸锶化合物。这些材料的磷光是由具有每种磷光体成分特定能量的光引发的。在许多情况下，这些材料的磷光也可以通过进一步用光进行激发而变暗，该光的能量低于产生初始辉光所需的最小能量。磷光体材料的可见变暗会产生类似于发射光的“关闭开关”或“橡皮擦”的效果。可以通过具有适当能量和强度的相干或非相干光源来产生产生磷光和变暗的光激发。由低能量光引起的磷光体变暗可用于视觉上出色的化学演示。另外，由于可以通过使用各种波长的光来控制和改变这些磷光体中低能态和高能态的电子分布，因此它们可用于说明与物种的稳态分布和反应动力学有关的概念，以及利用磷光控制释放的应用。

更新日期：2017-11-17

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