Journal of Electronic Materials

, Volume 45, Issue 1, pp 682–687 | Cite as

Frequency-Downconversion Stability of PMMA Coatings in Hybrid White Light-Emitting Diodes

  • Fulvio Caruso
  • Mauro Mosca
  • Salvatore Rinella
  • Roberto Macaluso
  • Claudio Calì
  • Filippo Saiano
  • Eric Feltin
Article
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Accepted:

Abstract

We report on the properties of a poly(methyl methacrylate)-based coating used as a host for an organic dye in hybrid white light-emitting diodes. The device is composed by a pump source, which is a standard inorganic GaN/InGaN blue light-emitting diode (LED) emitting at around 450 nm, and a spin-coated conversion layer making use of Lumogen® F Yellow 083. Under prolonged irradiation, the coating exhibits significant bleaching, thus degrading the color rendering performance of the LED. We present experimental results that confirm that the local temperature rise of the operating diode does not affect the conversion layer. It is also proven that, during the test, the photostability of the organic dye is compromised, resulting in a chromatic shift from Commission Internationale de l’Eclairage (CIE) (x;y) coordinates (0.30;0.39) towards the color of the pump (0.15;0.04). Besides photodegradation of the dye, we address a phenomenon attributed to modification of the polymer matrix activated by the LED’s blue light energy as confirmed by ultraviolet–visible and Fourier-transform infrared spectroscopic analyses. Three methods for improving the overall stability of the organic coating are presented.

Keywords

PMMA hybrid LEDs Lumogen® polymer degradation photostability spin coating 
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Copyright information

© The Minerals, Metals & Materials Society 2015

Authors and Affiliations

  • Fulvio Caruso
    • 1
  • Mauro Mosca
    • 1
  • Salvatore Rinella
    • 1
  • Roberto Macaluso
    • 1
  • Claudio Calì
    • 1
  • Filippo Saiano
    • 2
  • Eric Feltin
    • 3
  1. 1.Dipartimento di Energia, ingegneria dell’Informazione e modelli MatematiciUniversità degli Studi di PalermoPalermoItaly
  2. 2.Dipartimento di Scienze Agrarie e ForestaliUniversità degli Studi di PalermoPalermoItaly
  3. 3.NOVAGAN SàrlLausanneSwitzerland

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