Understanding the behavior of combinatorially developed luminescent materials requires detailed characterization methods that have been lacking thus far. We developed a device for directly surveying the luminescent properties of thin-film libraries created through combinatorial gradient sputter deposition. Step-scan recorded excitation-, emission- and luminescence decay spectra of a thin-film library were resolved and combined with EDX measurements on the same film, relating composition to luminescent properties. This technique was applied to a single-substrate gradient thin-film library of NaBr_0.73I_0.27 to NaBr_0.09I_0.91, doped with 6.5% to 16.5% Eu²⁺. This gradient film closely followed Vegard’s law, with emission fluently shifting from 428 to 439 nm. In comparison, pure NaBr:Eu²⁺ showed emission at 428 nm and NaI:Eu²⁺ at 441 nm. Luminescence decay measurements demonstrated a great degree of concentration quenching in the gradient film. From these measurements we could conclude that an optimized phosphor would most efficiently luminesce when close to NaI:Eu²⁺. This gradient film confirmed that the method presented in this work allows to both study and optimize luminescent behavior in a broad range of host- and dopant systems.

中文翻译：

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共溅射无机发光材料库的详细表征方法

要了解组合开发的发光材料的行为，需要迄今缺乏的详细表征方法。我们开发了一种用于直接调查通过组合梯度溅射沉积创建的薄膜库的发光特性的设备。解析了步进扫描记录的薄膜库的激发，发射和发光衰减光谱，并与同一膜上的EDX测量结合，将组成与发光特性相关联。将该技术应用于掺有6.5％至16.5％Eu ²⁺的NaBr _0.73 I _0.27至NaBr _0.09 I _0.91的单衬底梯度薄膜库。该梯度膜严格遵循Vegard定律，发射流利地从428 nm转移到439 nm。相比之下，纯NaBr：Eu ²⁺在428 nm处发射，而NaI：Eu ²⁺在441 nm处发射。发光衰减测量结果表明，梯度膜中存在很大程度的浓度猝灭。从这些测量结果我们可以得出结论，当接近NaI：Eu ²⁺时，优化的磷光体将最有效地发光。该梯度膜证实了这项工作中介绍的方法可以研究和优化各种宿主和掺杂剂系统中的发光行为。