5 February 2008 Using film nanostructure to control photoluminescence angular emission profiles
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Luminescent thin films are used for many applications, including light-emitting diodes, lasers and flat panel displays. Glancing angle deposition (GLAD) is a physical vapor deposition technique which relies on highly oblique flux angles to create porous thin films. When combined with real-time substrate motion control and measurement of deposition rates, it is possible to produce high quality nanostructered thin films. A rugate filter uses a sinusoidally varying index profile to produce a stop band. Using the GLAD technique, it is possible to produce a rugate filter from a single material. The central wavelength, depth and width of the stop band can be designed by adjusting the film nanostructure. In this paper, rugates composed of Y2O3:Eu are used to control the angular emission profiles of the photoluminescent thin film. Confined, annular and isotropic emission profiles film is nearly uniform for emission angles between ~ -60° and ~60°.
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M. T. Taschuk, M. T. Taschuk, J. P. Gospodyn, J. P. Gospodyn, J. C. Sit, J. C. Sit, M. J. Brett, M. J. Brett, "Using film nanostructure to control photoluminescence angular emission profiles", Proc. SPIE 6890, Optical Components and Materials V, 689005 (5 February 2008); doi: 10.1117/12.763382; https://doi.org/10.1117/12.763382

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