2 research outputs found
Photoelectronic Characteristics of Poly(p-phenylene vinylene) in Self-Assembled Multilayer Films
์์ด์จ๊ณผ ์์ด์จ ๊ณ ๋ถ์ ์ ํด์ง ์ฌ์ด์ ์ ์ ๊ธฐ์ ์ธ๋ ฅ์ ์ด์ฉํ ๋ถ์ ์๊ธฐ ์งํฉ์ฒด (self-as-sembly, SA) ๋ฐฉ๋ฒ์ผ๋ก ๊ณ ๋ถ์๋ฅผ ์ ์ ํ ๋ค์ธต ๋ฐ๋ง์ผ๋ก ๊ฐ๊ณตํ ์๊ฐ ์์๋ค. Poly(p-phenylenevinylene) (PPV) ์ ๊ตฌ์ฒด (precursor)์ poly(sodium 4-styrenesulfonate) (PSS)์ SA ๋ฐ๋ง์ ๋ง๋ค์ด ๊ทธ ์ฑ์ฅ ์์๊ณผ ์ด์ ํ ํ ๊ณต์ก ๊ธธ์ด ๋ฐ photoluminescence (PL) ์คํํธ๋ผ ๋ณํ๋ฅผ spin-coatingํ PPV ๋ฐ๋ง๊ณผ์ ๋น๊ต๋ฅผ ํตํด ์์๋ณด์๋ค. PPV ์ ๊ตฌ์ฒด/PSS ๋ค์ถฉ ๋ฐ๋ง์ ์ ์ธต๋ ์ธต์์ ๋น๋กํ๋, ์์ ๋ ๋ฐ๋ง ์ฑ์ฅ์ ๋ณด์ฌ ์ฃผ์๋ค. ๊ณต์ก ๊ตฌ์กฐ๋ก์ ์ด์ ํ์ด spin-coatingํ ๋ฐ๋ง๊ณผ๋ ๋งค์ฐ ๋ค๋ฅด๊ฒ ๊ด์ฐฐ๋์ด, SA ๊ณผ์ ์์ PPV ์ ๊ตฌ์ฒด์ ๋ถ์ฌ๋ ์ฌ์ฌ ๊ตฌ์กฐ์์ ์ ํ ์์๊ฐ ๊ณต์ก ๊ธธ์ด ๋ฐ ๊ทธ ๋ถํฌ๋ฅผ ์ ํํจ์ ์ ์ ์์๋ค. ๋ํ SA ๋ฐ๋ง์ ๊ทธ ๊ณต์ก ๊ธธ์ด์ ๊ด๊ณ์์ด ๊ฑฐ์ ์ผ์ ํ PL ์คํํธ๋ผ์ ๋ํ๋ด์์ผ๋ฉฐ, ๊ทธ ๋ฐฉ์ถ ํ์ฅ ๋ฐ ๋ชจ์๋ spin-coatingํ PPV ๋ฐ๋ง๊ณผ๋ ํฐ ์ฐจ์ด๊ฐ ์์๋ค. ์ด๋ฌํ SA ๋ฐ๋ฅ์ PL ํน์ฑ์ ๋ฐ๋ง๋ด PPV ์ฌ์ฌ๊ฐ์ exciton ์ด์ก์ด PSS์ ์ํด ๋ฐฉํด๋ฐ๊ธฐ ๋๋ฌธ์ธ ๊ฒ์ผ๋ก ์ถ์ ๋์๋ค. ; Self-assembly (SA) technique based on the electrostatic interactions between cationic and anionic polyelectrolytes provided a viable means to fabricate polymers into multilayer thin films. The self-assembled films made from poly(p-phenylene vinylene) (PPV) precursor and poly(sodium 4-styrenesulfonate) (PSS) were prepared, and their layer-by-layer growth and the changes of the conjugation lengths and the photoluminescence (PL) spectra after annealing were compared with those of spin-coated bulk PPV films. PPV precursor/PSS multilayer thin films showed stable growth behavior proportional to the number of deposition. The observed thermal conversion behavior toward the conjugated structure in the self-assembled films which was quite different from that of spin-coated films suggests that the conformational constraint on PPV precursor chains imposed by self-assembling process imparts limitation of conjugation length and its distribution. The self-assembled films with different conjugation lengths were also found to demonstrate almost the same PL spectra, whose, emission wavelength and shape were quite different from those of the spin-coated PPV films. It is believed that such PL spectral characteristics of the self-assembled films are due to the hindrance on exciton migrations between PPV chains (or layers) which is caused by PSS chains (or layers).๋ณธ ์ฐ๊ตฌ๋ 1996๋
๋ ๊ต์ก๋ถ ๋ฐ๋์ฒด๋ถ์ผ ํ์ ์ฐ๊ตฌ์กฐ์ฑ๋น(ISRC 96-E-4044)๋ก ์ํ๋์์ผ๋ฉฐ ์ด์ ๊ฐ์ฌ๋๋ฆฝ๋๋ค