Tunable orthogonal full‐color luminescence has emerged as a new class of smart luminescence phenomenon with wide applications ranging from photonics to biomedicine. However, the current research is focused on complex multilayer core‐shell nanostructures (e.g., 5–8 shell layers) with a single upconversion mode, greatly limiting their synthesis and practical application. Herein, this work proposes a simple core‐shell structure to integrate upconversion and downshifting dual‐mode luminescence based on Gd3+‐mediated interfacial energy transfer and Ce3+‐assisted cross relaxation. This design is able to suppress cross‐talk of multiple emissions and simplify the sample structure by removing the conventionally required intermediate isolation layer. Importantly, it further enables the arbitrarily controllable multicolor output at a single nanoparticle level by adopting the tri‐channel selective excitation wavelengths (980/808/254 nm), greatly expanding the conventional red‐green‐blue (RGB) color gamut. Moreover, the use of these nanoparticles promotes the information security level and the complexity of anti‐counterfeiting modes by adopting a pre‐set logic Morse information encryption and decryption strategy. These results provide effective guidance for the rational nanostructure design of novel orthogonal trichromatic emissive materials for a variety of frontier applications such as advanced anticounterfeiting and information security.

中文翻译：

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纳米结构中可调谐三通道正交全彩发光，用于防伪和信息安全


可调谐正交全彩发光已成为一类新型智能发光现象，应用范围从光子学到生物医学。然而，目前的研究集中在具有单一上转换模式的复杂多层核壳纳米结构（例如，5-8 层壳层）上，极大地限制了它们的合成和实际应用。在此，这项工作提出了一种简单的核壳结构，基于 Gd3+ 介导的界面能量转移和 Ce3+ 辅助的交叉弛豫来集成上转换和下移双模发光。这种设计能够抑制多重发射的串扰，并通过去除传统所需的中间隔离层来简化样品结构。重要的是，它通过采用三通道选择性激发波长 （980/808/254 nm） 进一步实现了单个纳米颗粒水平的任意可控多色输出，大大扩展了传统的红-绿-蓝 （RGB） 色域。此外，这些纳米粒子的使用通过采用预设的逻辑莫尔斯信息加密和解密策略，提高了信息安全水平和防伪模式的复杂性。这些结果为新型正交三色发光材料的合理纳米结构设计提供了有效的指导，用于高级防伪和信息安全等多种前沿应用。