探测蓝色长余辉Eu2 +/ Nd3 +激活的（Ca $_{0.9}$ Si $_{0.1}$）Al $_2$ O $_6$新兴荧光体基新型隐形油墨用于防伪防伪
Probing blue long persistent Eu2+/Nd3+ activated (Ca$_{0.9}$Si$_{0.1}$)Al$_2$O$_6$ emerging phosphor based novel invisible ink for knocking out fake security papers and combat counterfeiting
摘要：
本工作采用高温（1000- 1500 ℃）固相反应法合成了一类新型（Ca0.9Si0.1）Al 2 O 6：Eu 2+，Nd 3+长余辉发光材料。此外，使用环氧基胶体悬浮液将磷光体材料配制成磷光油墨。有趣的是，磷光油墨吸收环境能量，例如来自D 65和钨丝灯的白光、阳光、人造光等，储存能量并作为有效的蓝色光致发光（PL）发射，对于适应黑暗的人眼而言，该蓝色光致发光明显可见数小时。然而，最佳的PL发射中心在~450 nm已登记在~365 nm的激发，这是由于从4f 65 d1到4f 7能级的Eu 2+离子的跃迁。由于空穴在靠近价带的Nd ~（3+）位上的俘获和释放，导致了较长的光致发光持续时间。在优化的化学计量组成的磷光体中，在极暗条件下持续>4小时。此外，长持续性的现象使得能够使用快速响应（QR）码图案在商品和证书上创建/设计独特的隐藏标记。已经对保持在UV（~365 nm）激发下的各种模板进行了系统的研究，以有效地识别假货币、条形码和打击伪造。
英文摘要：
In the current work, a novel class of (Ca0.9Si0.1)Al2O6:Eu2+,Nd3+ long persistent phosphor was synthesized using high-temperature (1000-1500oC) solid-state reaction method. Further, the phosphor material was formulated into a phosphorescent ink using epoxy based colloidal suspension. Interestingly the phosphorescent ink absorbs ambient energies such as white light from D65 and tungsten lamps, sunlight, artificial lights etc., stores up the energy and emit as efficient blue colored photoluminescence (PL) apparently visible for many hours for dark adapted human eye. However, the optimum PL emission centred at ~450 nm has been registered at ~365 nm excitation that is attributed to transitions from 4f65d1 to 4f7 energy levels of Eu2+ ions. The longer persistence of PL aroused due to trapping and de-trapping of holes at Nd3+ sites situated proximate to valance band. In the optimised stoichiometric composition of the phosphor, the persistence lasted for >4 hours in extremely dark conditions. Furthermore, the phenomenon of long persistence enables to create/design unique hidden markings on goods and certificates using quick response (QR) code patterns. Systematic studies have been performed on various templates kept under UV (~365 nm) excitation to identify fake currencies, barcodes and combat counterfeiting effectively.
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