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Optical Materials Express

Optical Materials Express

  • Editor: David Hagan
  • Vol. 4, Iss. 5 — May. 1, 2014
  • pp: 924–933

Highly efficient blue emitting materials based on indenopyrazine derivatives for OLEDs [Invited]

Hayoon Lee, Young IL Park, Beomjin Kim, Ji-Hoon Lee, and Jongwook Park  »View Author Affiliations


Optical Materials Express, Vol. 4, Issue 5, pp. 924-933 (2014)
http://dx.doi.org/10.1364/OME.4.000924


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Abstract

Two indenopyrazine compounds for organic light emitting diodes were synthesized with phenanthrene or pyrene side groups that have high photoluminescence (PL) quantum efficiency (QE); 6,6,12,12-Tetraethyl-2,8-di-phenanthren-9-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine (PA-EIP) and 2-(10b,10c-Dihydro-pyren-1-yl)-6,6,12,12-tetraethyl-8-pyren-1-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine (PY-EIP). The PL spectra of PA-EIP and PY-EIP in film state were 440 nm and 468nm in the blue region, respectively. Td values for PA-EIP and PY-EIP were very high at 432°C and 441°C. Tm values were 385°C and 390°C for PA-EIP and PY-EIP. When the synthesized compounds were used as emitting layers in non-doped OLED devices, PA-EIP and PY-EIP showed luminance efficiencies of 1.35 and 5.15 cd/A, power efficiencies of 0.69 and 2.81 lm/W, and CIEs of (0.17, 0.15) and (0.19, 0.30), respectively. This result shows that efficiency of final emitter increases with increasing efficiency of side group. Additionally, in the solution-processed white OLED devices using PY-EIP as one of emitting materials, the device showed high luminance efficiency of 3.95 cd/A, power efficiency of 2.45 lm/W and CIE value of (0.269, 0.294) at 6 V.

© 2014 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Organic Compounds for OLEDs

History
Original Manuscript: February 27, 2014
Revised Manuscript: March 29, 2014
Manuscript Accepted: April 1, 2014
Published: April 7, 2014

Virtual Issues
Optical Materials for Flat Panel Displays (2013) Optical Materials Express

Citation
Hayoon Lee, Young IL Park, Beomjin Kim, Ji-Hoon Lee, and Jongwook Park, "Highly efficient blue emitting materials based on indenopyrazine derivatives for OLEDs [Invited]," Opt. Mater. Express 4, 924-933 (2014)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-4-5-924


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