A luminescent quadruple stranded dinuclear Eu(III) complex based on 2,8-bis(4′,4′,4′-trifluoro-1′,3′-dioxobutyl)-dibenzothiophene for light-emitting diodes

Abstract

A red luminescent quadruple stranded dinuclear Eu(III) complex was synthesized shown as below. Bright red LEDs were successfully fabricated by coating the complex onto InGaN chip. The complex may act as a red component in fabrication of white LED with high color-rendering index. A luminescent quadruple stranded dinuclear Eu(III) complex Na 2 [Eu 2 (dbt) 4 ] was synthesized, where H 2 dbt was 2,8-bis(4′,4′,4′-trifluoro-1′,3′-dioxobutyl)-dibenzothiophene. The complex emits the characteristic red luminescence of Eu 3+ ion due to the 5 D 0 → 7 F J ( J = 0–4) transitions under 395 nm-light excitation with a luminescent quantum efficiency of 23%. Bright red light-emitting diodes (LEDs) were fabricated by coating the complex onto 395 nm-emitting InGaN chip. The results indicate that the complex may act as a red component in the fabrication of near UV-based white light-emitting diodes with high color-rendering index.