An efficient bonding-type Eu-containing copolymer as red phosphor applied in LED

A luminescent europium-containing copolymer, poly(MMA- UA -co-Eu (DBM)2 (TOPO)2)was synthesized The copolymer was characterized by FT-IR, UV–vis, gel permeation chromatograph (GPC), ICP, thermogravimetric analysis (TGA), derivative thermal gravimetric analysis (DTG) and differential scanning calorimetry (DSC). The Eu-copolymer phosphor exhibited high thermal stability, high glass transition, excellent photoluminescence properties (PL), appropriate CIE chromaticity coordinates for red and good quantum yield (18%) under near-UV light excitation. An intense red-emitting light-emitting diode (LED) was fabricated by combining poly[UA-MMA-co-Eu (DBM)2(TOPO)2] with a 395 nm-emitting InGaN chip. The results indicate that the Eu-copolymer phosphor may act as a red component for fabrication of white LEDs.

Research Highlights
► Poly (UA-MMA) was prepared by reversed emulsion polymerization, methodology is simple, and shows big yield.
► The synthesis routines of copolymer poly(MMA-UA-co-Eu(DBM)2 (TOPO)2) as outlined in Fig. 1 is very convenient.
► The Eu-copolymer phosphor exhibited high thermal stability, high glass transition, excellent photoluminescence properties (PL), appropriate CIE chromaticity coordinates for red and good quantum yield (18%) under near-UV light excitation.
► The Eu-copolymer phosphor may act as a red component for fabrication of white LEDs.