6533b823fe1ef96bd127f244

RESEARCH PRODUCT

Stability improvement of PMMA and Lumogen® coatings for hybrid white LEDs

Fulvio CarusoMauro MoscaRoberto MacalusoClaudio Cali'Filippo SaianoS RinellaE. Feltin

subject

PMMA white LEDs hybrid LEDs perylene-based dyes Lumogen® polymer degradation LED optical characterization spin coating.Settore ING-INF/01 - Elettronica

description

Hybrid white LEDs employing perylene-based dyes for the frequency down-conversion of blue light, generated by a standard inorganic source, suffer from colour rendering variations due to the degradation of the organic molecule under prolonged irradiation. To avoid such inconvenient, proper encapsulation of the dyes in resins or other polymer matrices can prevent their accelerated ageing; nevertheless, embedding polymers can also exhibit significant bleaching caused by chemico-physical agents. Among all, polymethyl methacrilate (PMMA) is one of the most used materials for the fabrication of hybrid LEDs' colour conversion coatings, therefore its stability needs to be investigated.

yearjournalcountryeditionlanguage
2014-08-07
http://hdl.handle.net/10447/97986