4.7 Article

Thermally Cross-Linkable Hole Transport Polymers for Solution-Based Organic LightEmitting Diodes

Journal

MACROMOLECULAR RAPID COMMUNICATIONS
Volume 35, Issue 8, Pages 807-812

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201400002

Keywords

conjugated polymers; curing of polymers; heteroatom-containing polymers; light-emitting diodes; spin coating

Funding

  1. Basic Science Research Program through the National Research Foundation of Korea (NRF)
  2. Ministry of Education, Science and Technology [NRF-2011-0006847]
  3. Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant [20134010200490]
  4. Korea Government Ministry of Trade, Industry and Energy
  5. New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
  6. Korea Government Ministry of Trade, Industry Energy [20113010010030]
  7. Korea Evaluation Institute of Industrial Technology (KEIT) [20134010200490] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  8. National Research Foundation of Korea [2011-0006847] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Two thermally cross-linkable hole transport polymers that contain phenoxazine and triphenylamine moieties, X-P1 and X-P2, are developed for use in solution-processed multi-stack organic light-emitting diodes (OLEDs). Both X-P1 and X-P2 exhibit satisfactory cross-linking and optoelectronic properties. The highest occupied molecular orbital (HOMO) levels of X-P1 and X-P2 are -5.24 and -5.16 eV, respectively. Solution-processed super yellow polymer devices (ITO/X-P1 or X-P2/PDY-132/LiF/Al) with X-P1 or X-P2 hole transport layers of various thicknesses are fabricated with the aim of optimizing the device characteristics. The fabricated multi-stack yellow devices containing the newly synthesized hole transport polymers exhibit satisfactory currents and power efficiencies. The optimized X-P2 device exhibits a device efficiency that is dramatically improved by more than 66% over that of a reference device without an HTL. image

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