Directional Emission of Fluorescent Dye-Doped Dielectric Nanogratings for Lighting Applications,ACS Applied Materials & Interfaces

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Directional Emission of Fluorescent Dye-Doped Dielectric Nanogratings for Lighting Applications
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acsami.8b08971
Antonio Ferraro _{1,

2} , Dimitrios C. Zografopoulos ₂ , Marc A. Verschuuren ₃ , Dick K. G. de Boer ₄ , Frank Kong ₅ , H. Paul Urbach ₅ , Romeo Beccherelli ₂ , Roberto Caputo ₁

Affiliation

By structuring a luminescent dielectric interface as a relief diffraction grating with nanoscale features, it is possible to control the intensity and direction of the emitted light. The composite structure of the grating is based on a fluorescent dye (Lumogen F RED 305) dispersed in a polymeric matrix (poly(methyl methacrylate)). Measurements demonstrate a significant enhancement of the emitted light for specific directions and wavelengths when the grating interface is compared to nonstructured thin films made of the same material. In particular, the maximum enhancement of photoluminescence for a given pump wavelength is obtained at an angle of incidence that is close to the Rayleigh anomaly condition for the first-order diffracted waves. In this condition, the maximum extinction of incident light is observed. Upon excitation with coherent and monochromatic sources, photoluminescence plots show that the Rayleigh anomalies confine the angular interval of the emitted light. Being the anomalies directly related to the pitch of the diffraction grating, the system can be thus implemented as an optical device whose directional emission can be designed for specific applications. The exploitation of nanoimprinting techniques for the fabrication of the luminescent grating enables production of the device on large areas, paving the way for low-cost lighting and solar applications.

中文翻译：

照明用荧光染料掺杂介电纳米光栅的定向发射

通过将发光电介质界面构造为具有纳米级特征的浮雕衍射光栅，可以控制发射光的强度和方向。光栅的复合结构基于分散在聚合物基体（聚（甲基丙烯酸甲酯））中的荧光染料（Lumogen F RED 305）。测量结果表明，当将光栅界面与相同材料制成的非结构化薄膜进行比较时，可以针对特定方向和特定波长显着增强发射光。特别地，对于给定的泵浦波长，在接近于一阶衍射波的瑞利异常条件的入射角处获得了最大的光致发光增强。在这种情况下，观察到入射光的最大消光。在用相干和单色光源激发后，光致发光图表明瑞利异常限制了发射光的角度间隔。由于异常与衍射光栅的间距直接相关，因此该系统可以实现为一种光学设备，其定向发射可以针对特定应用进行设计。利用纳米压印技术制造发光光栅，可以在大面积上生产该器件，从而为低成本照明和太阳能应用铺平了道路。因此，该系统可以实现为可针对特定应用设计定向发射的光学设备。利用纳米压印技术制造发光光栅，可以在大面积上生产该器件，从而为低成本照明和太阳能应用铺平了道路。因此，该系统可以实现为可针对特定应用设计定向发射的光学设备。利用纳米压印技术制造发光光栅，可以在大面积上生产该器件，从而为低成本照明和太阳能应用铺平了道路。

更新日期：2018-07-05

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