Mechanoluminescence in BaSi2O2N2:Eu

作者：Botterman Jonas; Van den Eeckhout Koen; De Baere Ives; Poelman Dirk; Smet Philippe F^*

来源：Acta Materialia, 2012, 60(15): 5494-5500.

DOI：10.1016/j.actamat.2012.06.055

• Mechanoluminescence
• Persistent phosphor
• Charge trapping
• Thermoluminescence
• Piezoelectric materials

Mechanoluminescence (ML), a general term for the phenomenon in which light emission occurs during any mechanical action on a solid, can be divided roughly into two classes: destructive ML and non-destructive ML. For practical use in high-end applications (e.g. pressure sensors), materials with non-destructive ML properties are preferred. This paper reports on the strong non-destructive ML in BaSi2O2N2:Eu. When irradiated in advance with ultraviolet or blue light, this phosphor shows intense blue-green light emission upon mechanical stimulation such as friction or pressure. The ML has an emission band peaking at 498 nm, which is similar to 4 nm red-shifted compared to the steady-state photoluminescence. The origin of the ML is discussed and related to the persistent luminescence of BaSi2O2N2:Eu. The same traps are responsible for both phenomena. Based on the occurrence of ML in this phosphor, we were able to show that the predominant crystallographic structure of BaSi2O2N2:Eu belongs to space group Cmc2(1).

• 出版日期2012-9