The combination of light‐emitting diodes (LEDs) and rare earth (RE) phosphors as color‐converting layers comprises the basis of solid‐state lighting. Indeed, most LED lamps include a photoluminescent coating made of phosphor material, i.e., crystalline matrix suitably doped with RE elements, to produce white light from a blue or ultraviolet LED chip. Transparent phosphor‐based films constitute starting materials for new refined emitters that allow different photonic designs to be implemented. Among the different photonic strategies typically employed to tune or enhance emission, surface texturing has proved its versatility and feasibility in a wide range of materials and devices. However, most of the nanofabrication techniques cannot be applied to RE phosphors directly because of their chemical stability or because of their cost. The first monolithic patterned structure of down‐shifting nanophosphors with square arrays of nanoholes with different lattice parameters is reported in this study. It is shown that a low‐cost soft‐nanolithography procedure can be applied to red‐emitting nanophosphors (GdVO₄:Eu³⁺ nanocrystals) to tune their emission properties, attaining a twofold directional enhancement of the emitted light at predesigned emission wavelengths in specific directions.

中文翻译：

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从图案化的稀土磷光膜中增强的定向光提取

发光二极管（LED）和稀土（RE）磷光体作为颜色转换层的组合构成了固态照明的基础。实际上，大多数LED灯包括由磷光体材料制成的光致发光涂层，即，适当地掺杂有RE元素的晶体基质，以从蓝色或紫外LED芯片产生白光。基于透明磷光体的薄膜构成了新型精制发射器的原材料，这些发射器可实现不同的光子设计。在通常用于调整或增强发射的不同光子策略中，表面纹理化已证明其在多种材料和设备中的多功能性和可行性。但是，由于其化学稳定性或成本原因，大多数纳米制造技术不能直接应用于可再生荧光粉。本研究报道了第一个具有向下移位的纳米磷光体的单片结构，该结构具有不同晶格参数的方形纳米孔阵列。结果表明，低成本的软纳米光刻工艺可以应用于发红光的纳米磷光体（GdVO₄：Eu ³⁺纳米晶体）以调整其发射特性，从而在特定方向上以预先设计的发射波长实现发射光的双向定向增强。