White light emission from blue InGaN LED with fluorescent conjugated polymer blends

Hong Jeong Yu, Kwanhwi Park, Wonkeun Chung, Jihyun Klm, Byung H. Chun, Sung Hyun Kim

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11 Citations (Scopus)

Abstract

White LEDs were fabricated by precoating blue InGaN LEDs with blends of a green emitting polymer (Poly[{9, 9-dioctyl-2, 7-divinylenefluorenylene)-alto-co- (2-methoxy-5-(2-ethylhexyloxy)-l, 4-phenylene)], PFPV) and a red emitting polymer (Poly[l-methoxy-4-(2-ethylhexyloxy-2, 5-phenylenevinylene)], MEH-PPV), which acted as the phosphor. The two polymers were blended in different weight ratios, which were found to affect the green (555 nm) and red (610 nm) emission intensity. The CIE-1931 coordinate, Tc and Ra all changed as the MEH-PPV content increased. The white LED of the polymer blend phosphor containing 33wt% MEH-PPV had a luminous efficiency of 54.2 lm/W at 20 mA with a CIE-1931 coordinate, Tc and Ra of (0.3328. 0.3547L 5488 and 71.4. respectively.

Original languageEnglish
Pages (from-to)1076-1079
Number of pages4
JournalPolymer Journal
Volume41
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

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Keywords

  • Conjugated polymer blending
  • Electroluminescence
  • Phosphors
  • White light emitting diodes

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

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