Luminescence properties of structurally modified PPVs: PPPV derivatives bearing 2-(4-tert-butylphenyl)-5-phenyl-1,3,4-oxadiazole pendants

D. Won Lee, K. Y. Kwon, J. I. Jin, Y. Park, Y. R. Kim, I. W. Hwang

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Two new poly(p-phenylenevinylene) (PPV) derivatives bearing 2-phenyl-5-(4-tert-butylphenyl) -1,3,4-oxadiazole pendants were prepared, and their photo- and electroluminescence properties were studied. The first polymer (P-1) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4oxadiazolyl]phenyl}-l, 4-phenylenevinylene], which is a PPV derivative having diphenyl-substituted 1,3,4-oxadiazole pendant that is known to be an excellent electron-transporting structure. The second polymer (P-2) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenyl}-5- (2-ethylhexyloxy)-1,4-phenylenevinylene]. The only structural difference between P-1 and P-2 is the presence of additional 2-ethylhexyloxy pendant groups in P-2. Both polymers were prepared by direct polymerization of the α,α'-dibromo-p-xylene monomers having the pendant group(s) in the presence of excess potassium tert-butoxide. Both polymers reveal much improved electroluminescence (EL) properties when compared with PPV. They emit luminescence light over the wavelength range from about 500 to 600 nm. The external quantum efficiencies of P-1 and P-2 were respectively 16 and 56 times the value for PPV when LED devices were fabricated using an indium-tin oxide (ITO) coated glass anode and the aluminum cathode. In particular, the EL device ITO/poly(3,4-ethylenedioxy-2,4-thienylene) /P-2/Al:Li geometry revealed a maximum luminance of 1090 cd/m2 at the electric field of 2.36 MV/cm with the external quantum efficiency of 0.045%. The maximum brightness of the ITO/P-2/Ca/Al was 7570 cd/m2 at the electric field of 2.80 MV/cm.

Original languageEnglish
Pages (from-to)565-574
Number of pages10
JournalChemistry of Materials
Volume13
Issue number2
DOIs
Publication statusPublished - 2001 Mar 19

Fingerprint

Bearings (structural)
Luminescence
Polymers
Electroluminescence
Tin oxides
Indium
Derivatives
Quantum efficiency
Luminance
Electric fields
Xylene
Aluminum
Light emitting diodes
Potassium
Photoluminescence
Anodes
Cathodes
Monomers
Polymerization
Glass

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

@article{0817c40067634fa09e0580900dc0d738,
title = "Luminescence properties of structurally modified PPVs: PPPV derivatives bearing 2-(4-tert-butylphenyl)-5-phenyl-1,3,4-oxadiazole pendants",
abstract = "Two new poly(p-phenylenevinylene) (PPV) derivatives bearing 2-phenyl-5-(4-tert-butylphenyl) -1,3,4-oxadiazole pendants were prepared, and their photo- and electroluminescence properties were studied. The first polymer (P-1) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4oxadiazolyl]phenyl}-l, 4-phenylenevinylene], which is a PPV derivative having diphenyl-substituted 1,3,4-oxadiazole pendant that is known to be an excellent electron-transporting structure. The second polymer (P-2) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenyl}-5- (2-ethylhexyloxy)-1,4-phenylenevinylene]. The only structural difference between P-1 and P-2 is the presence of additional 2-ethylhexyloxy pendant groups in P-2. Both polymers were prepared by direct polymerization of the α,α'-dibromo-p-xylene monomers having the pendant group(s) in the presence of excess potassium tert-butoxide. Both polymers reveal much improved electroluminescence (EL) properties when compared with PPV. They emit luminescence light over the wavelength range from about 500 to 600 nm. The external quantum efficiencies of P-1 and P-2 were respectively 16 and 56 times the value for PPV when LED devices were fabricated using an indium-tin oxide (ITO) coated glass anode and the aluminum cathode. In particular, the EL device ITO/poly(3,4-ethylenedioxy-2,4-thienylene) /P-2/Al:Li geometry revealed a maximum luminance of 1090 cd/m2 at the electric field of 2.36 MV/cm with the external quantum efficiency of 0.045{\%}. The maximum brightness of the ITO/P-2/Ca/Al was 7570 cd/m2 at the electric field of 2.80 MV/cm.",
author = "{Won Lee}, D. and Kwon, {K. Y.} and Jin, {J. I.} and Y. Park and Kim, {Y. R.} and Hwang, {I. W.}",
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language = "English",
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Luminescence properties of structurally modified PPVs : PPPV derivatives bearing 2-(4-tert-butylphenyl)-5-phenyl-1,3,4-oxadiazole pendants. / Won Lee, D.; Kwon, K. Y.; Jin, J. I.; Park, Y.; Kim, Y. R.; Hwang, I. W.

In: Chemistry of Materials, Vol. 13, No. 2, 19.03.2001, p. 565-574.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Luminescence properties of structurally modified PPVs

T2 - PPPV derivatives bearing 2-(4-tert-butylphenyl)-5-phenyl-1,3,4-oxadiazole pendants

AU - Won Lee, D.

AU - Kwon, K. Y.

AU - Jin, J. I.

AU - Park, Y.

AU - Kim, Y. R.

AU - Hwang, I. W.

PY - 2001/3/19

Y1 - 2001/3/19

N2 - Two new poly(p-phenylenevinylene) (PPV) derivatives bearing 2-phenyl-5-(4-tert-butylphenyl) -1,3,4-oxadiazole pendants were prepared, and their photo- and electroluminescence properties were studied. The first polymer (P-1) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4oxadiazolyl]phenyl}-l, 4-phenylenevinylene], which is a PPV derivative having diphenyl-substituted 1,3,4-oxadiazole pendant that is known to be an excellent electron-transporting structure. The second polymer (P-2) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenyl}-5- (2-ethylhexyloxy)-1,4-phenylenevinylene]. The only structural difference between P-1 and P-2 is the presence of additional 2-ethylhexyloxy pendant groups in P-2. Both polymers were prepared by direct polymerization of the α,α'-dibromo-p-xylene monomers having the pendant group(s) in the presence of excess potassium tert-butoxide. Both polymers reveal much improved electroluminescence (EL) properties when compared with PPV. They emit luminescence light over the wavelength range from about 500 to 600 nm. The external quantum efficiencies of P-1 and P-2 were respectively 16 and 56 times the value for PPV when LED devices were fabricated using an indium-tin oxide (ITO) coated glass anode and the aluminum cathode. In particular, the EL device ITO/poly(3,4-ethylenedioxy-2,4-thienylene) /P-2/Al:Li geometry revealed a maximum luminance of 1090 cd/m2 at the electric field of 2.36 MV/cm with the external quantum efficiency of 0.045%. The maximum brightness of the ITO/P-2/Ca/Al was 7570 cd/m2 at the electric field of 2.80 MV/cm.

AB - Two new poly(p-phenylenevinylene) (PPV) derivatives bearing 2-phenyl-5-(4-tert-butylphenyl) -1,3,4-oxadiazole pendants were prepared, and their photo- and electroluminescence properties were studied. The first polymer (P-1) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4oxadiazolyl]phenyl}-l, 4-phenylenevinylene], which is a PPV derivative having diphenyl-substituted 1,3,4-oxadiazole pendant that is known to be an excellent electron-transporting structure. The second polymer (P-2) is poly[2-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenyl}-5- (2-ethylhexyloxy)-1,4-phenylenevinylene]. The only structural difference between P-1 and P-2 is the presence of additional 2-ethylhexyloxy pendant groups in P-2. Both polymers were prepared by direct polymerization of the α,α'-dibromo-p-xylene monomers having the pendant group(s) in the presence of excess potassium tert-butoxide. Both polymers reveal much improved electroluminescence (EL) properties when compared with PPV. They emit luminescence light over the wavelength range from about 500 to 600 nm. The external quantum efficiencies of P-1 and P-2 were respectively 16 and 56 times the value for PPV when LED devices were fabricated using an indium-tin oxide (ITO) coated glass anode and the aluminum cathode. In particular, the EL device ITO/poly(3,4-ethylenedioxy-2,4-thienylene) /P-2/Al:Li geometry revealed a maximum luminance of 1090 cd/m2 at the electric field of 2.36 MV/cm with the external quantum efficiency of 0.045%. The maximum brightness of the ITO/P-2/Ca/Al was 7570 cd/m2 at the electric field of 2.80 MV/cm.

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