The increase in forgery in documents and authentic products has motivated the search for new high-end anti-counterfeiting strategies. Various chameleon-like luminescent materials such as up-conversion nanoparticles or perovskite nanocrystals have drawn attention due to their favorable properties. However, these materials are fabricated through complex processes and often suffer from system instability. In this work a facile and inexpensive approach for color tuning of thermally and chemically stable Ho³⁺/Tm³⁺/Yb³⁺ doped tellurite glasses is experimentally demonstrated for the first time. The emission band ratios are successfully manipulated by focusing/defocusing the NIR laser beam irradiating the glass samples. Impressive up-conversion quantum yield values up to 4.56% are obtained along with high lifetime values from ∼100 to 200 microseconds. As proof of concept, a series of anti-counterfeiting patterns are created using the screen-printing method and different emission colors are observed by easily changing the distance between the sample and the laser focal point. The applicability of the presented strategy along with the remarkable properties of the studied lanthanide doped glasses proves the capability of these materials to be used in anti-counterfeiting applications.

中文翻译：

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基于NIR激光驱动镧系元素掺杂发光玻璃的高端防伪应用的直接方法

文件和真实产品伪造的增加促使人们寻求新的高端防伪策略。各种变色龙状发光材料，例如上转换纳米颗粒或钙钛矿纳米晶体，由于其良好的性能而受到关注。但是，这些材料是通过复杂的过程制造的，并且经常遭受系统不稳定的困扰。在这项工作中，一种简便且廉价的方法可以对热和化学稳定的Ho ³⁺ / Tm ³⁺ / Yb ³⁺进行颜色调整掺杂的亚碲酸盐玻璃首次通过实验证明。通过聚焦/散焦照射玻璃样品的NIR激光束可以成功地控制发射带比率。获得高达4.56％的令人印象深刻的上转换量子产率值以及从100到200微秒的高寿命值。作为概念验证，使用丝网印刷方法创建了一系列防伪图案，并通过轻松更改样品与激光焦点之间的距离来观察到不同的发射颜色。所提出的策略的适用性以及所研究的掺杂镧系元素的玻璃的卓越性能证明了这些材料在防伪应用中的能力。