Highly efficient red-emitting hybrid polymer light-emitting diodes via förster resonance energy transfer based on homogeneous polymer blends with the same polyfluorene backbone

Bo Ram Lee, Wonho Lee, Thanh Luan Nguyen, Ji Sun Park, Ji Seon Kim, Jin Young Kim, Han Young Woo, Myoung Hoon Song

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Highly efficient inverted-type red-emitting hybrid polymeric light-emitting diodes (HyPLEDs) were successfully demonstrated via Förster resonance energy transfer (FRET) and interfacial engineering of metal oxide with a cationic conjugated polyelectrolyte (CPE). Similarly structured green- and red-emissive polyfluorene copolymers, F8BT and F8TBT, were homogeneously blended as a FRET donor (host) and acceptor (dopant). A cationic polyfluorene-based CPE was also used as an interfacial layer for optimizing the charge injection/transport and improving the contact problem between the hydrophilic ZnO and hydrophobic polymer layer. A long Förster radius (R0 = 5.32 nm) and high FRET efficiency (∼80%) was calculated due to the almost-perfect spectral overlap between the emission of F8BT and the absorption of F8TBT. A HyPLED containing 2 wt % F8TBT showed a pure red emission (λmax = 640 nm) with a CIE coordinate of (0.62, 0.38), a maximum luminance of 26 400 cd/m2 (at 12.8 V), a luminous efficiency of 7.14 cd/A (at 12.8 V), and a power efficiency of 1.75 lm/W (at 12.8 V). Our FRET-based HyPLED realized the one of the highest luminous efficiency values for pure red-emitting fluorescent polymeric light-emitting diodes reported so far.

Original languageEnglish
Pages (from-to)5690-5695
Number of pages6
JournalACS Applied Materials and Interfaces
Volume5
Issue number12
DOIs
Publication statusPublished - 2013 Jun 26
Externally publishedYes

Keywords

  • energy transfer
  • F8BT
  • F8TBT
  • hybrid polymer light-emitting diodes (HyPLEDs)
  • red emission

ASJC Scopus subject areas

  • Materials Science(all)

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