PMMA or PVDF films blended with β-diketonate tetrakis Eu or Tb complexes used as downshifting coatings of near-UV LEDs.

Luminescent Ln complexes incorporated in polymeric films exhibit narrow emission bands and absorption within the near-UV/blue spectral range, and enhanced phostability, which qualify them to be explored for solid-state lighting. Herein, (CHN)[Eu(dbm)] and Na[Tb(acac)], (CHN = didodecyldimethylammonium, dbm =1,3-diphenyl-1,3-propanedionate, acac = acetylacetonate), were dispersed in PMMA or PVDF films to protect them from degradation, and the obtained blends were applied as downshifting coatings on near-UV emitter LEDs. Upon such excitation, both Eu and Tb complexes emit red or green light with absolute emission quantum yields of 6.