Hybrid LED용 Perylene bisimide계 적색 유기형광체의 합성 및 특성 연구

Abstract

The white light of hybrid LED is using red and green organic fluorescent layers made in PMMA film as color down-conversion layers of blue light-emitting diodes. In this research, we report the synthesis and characterization of red organic phosphor by using perylene bisimide derivatives. The solubility, thermal stability and luminous efficiency are important characteristics of organic fluorescent for hybrid LED. We prepared red organic fluorescent(1C,1D,1E) by the reaction of phenol, 4-bromophenol, 4-iodophenol with N,N`-bis(4-bromo-2,6-diisopropylphenyl)-1,6,7,12-tetrachloroperylene-3,4,9,10-tetracarboxyl diimide (1B) in the presence of DMF, at 70℃. The synthesized derivatives were characterized by using H-NMR, FT-IR, UV/Vis absorbtion &PL spectra, and TGA analysis. The absorbtion and emission of (1C,1D,1E) was shown at 576-610 nm in UV/Vis spectrum. In the solubility analysis, Bromo-perylene and Halophenoxy-perylene showed the good solubility in general organic solvents such as CHCl, EA, DMF, MeOH. And in TGA thermogram, perylene fluorescent (1) with 4-bromophenol have shown good thermal stability. Especially, (1C) showed good thermal stability without significant weight loss to 220℃. The blended films of (1C,1D,1E) with PMMA(polymethyl methacrylate) at different weight % concentration such as 10, 5, 1 weight % have been prepared. The blended film was shown at 610-616 nm when monitored at 450 nm in PL emission spectra.