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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 2 — Jan. 21, 2008
  • pp: 1115–1124

White emitting polyfluorene functionalized with azide hybridized on near-UV light emitting diode for high color rendering index

Ilkem Ozge Huyal, Tuncay Ozel, Unsal Koldemir, Sedat Nizamoglu, Donus Tuncel, and Hilmi Volkan Demir  »View Author Affiliations

Optics Express, Vol. 16, Issue 2, pp. 1115-1124 (2008)

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We develop and demonstrate high-quality white light generation that relies on the use of a single-type simple conjugated polymer of polyfluorene functionalized with azide groups (PFA) integrated on a near-UV LED platform. The high-quality white emission from the polyfluorene is achieved by using the azide functionalization to facilitate cross-linking intentionally when cast into solid-state form. Hybridized on n-UV InGaN/GaN LED at 378 nm, the PFA emitters collectively generate a very broad down-converting photoluminescence at longer wavelengths across the entirety of the visible spectrum, yielding high color rendering indices up to 91.

© 2008 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes
(250.0250) Optoelectronics : Optoelectronics

ToC Category:

Original Manuscript: November 6, 2007
Revised Manuscript: December 18, 2007
Manuscript Accepted: January 12, 2008
Published: January 15, 2008

Ilkem O. Huyal, Tuncay Ozel, Unsal Koldemir, Sedat Nizamoglu, Donus Tuncel, and Hilmi Volkan Demir, "White emitting polyfluorene functionalized with azide hybridized on near-UV light emitting diode for high color rendering index," Opt. Express 16, 1115-1124 (2008)

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  29. PFB, bromide functionalized polyfluorene, poly[(9,9-dihexylfluorene)-co-alt-(9,9-bis-(6-bromohexyl)fluorene)] Yield: 1.1 g, 64%. IR (KBr, cm-1): 3065 (CH-), 2935 (CH-), 2859 (CH-), 1613 (C= C-), 1571 (C=C-), 727 (C-Br). 1H-NMR (400 MHz, CDCl3): δH 7.85 (m, 12H), 3.32 (t, 4H, J=6 Hz), 2.16 (m, 4H), 1.71 (m, 4H), 1.22 (m, 24H), 0.84 (m, 14H). Gel-permeation chromatography (GPC): Mn= 3.87 x 103, Mw= 2.04 x 104 (Polystyrene as standard). Fluorescence quantum yield (FQY): 0.88 (Quinine sulfate as the standard).
  30. PFA, azide functionalized polyfluorene, poly[(9,9-dihexylfluorene)-co-alt-(9,9-bis-(6-azidohexyl)fluorene)] Yield: 205 mg, 75%. IR (KBr, cm-1): 3065 (CH-), 2935 (CH-), 2859 (CH-), 2100 (-N3), 1613 (C=C-), 1571 (C=C-). 1H-NMR (400 MHZ, CDCl3) δH 7.78 (m, 12H), 3.17 (m, 4H), 1.95 (m, 4H), 1.7 (m, 4H), 1.20 (m, 8H), 0.65 (m, 4H, f). Gel-permeation chromatography (GPC): Mn= 3.61 x 103, Mw= 2.04 x 104 (Polystyrene as standard). Fluorescence quantum yield (FQY): 0.86 (Quinine sulfate as the standard).
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