Hilmi Volkan Demir et al 2007 New J. Phys. 9 362 doi:10.1088/1367-2630/9/10/362
White light generation tuned by dual hybridization of nanocrystals and conjugated polymers
Hilmi Volkan Demir1,2,3,6, Sedat Nizamoglu1,2, Tuncay Ozel1,2, Evren Mutlugun1,2, Ilkem Ozge Huyal1,4, Emre Sari1,3, Elisabeth Holder5 and Nan Tian5
Show affiliationsDual hybridization of highly fluorescent conjugated polymers and highly luminescent nanocrystals (NCs) is developed and demonstrated in multiple combinations for controlled white light generation with high color rendering index (CRI) (> 80) for the first time. The generated white light is tuned using layer-by-layer assembly of CdSe/ZnS core-shell NCs closely packed on polyfluorene, hybridized on near-UV emitting nitride-based light emitting diodes (LEDs). The design, synthesis, growth, fabrication and characterization of these hybrid inorganic–organic white LEDs are presented. The following experimental realizations are reported: (i) layer-by-layer hybridization of yellow NCs (λPL=580 nm) and blue polyfluorene (λPL=439 nm) with tristimulus coordinates of (x, y)=(0.31, 0.27), correlated color temperature of Tc=6962 K and CRI of Ra=53.4; (ii) layer-by-layer assembly of yellow and green NCs (λPL=580 and 540 nm) and blue polyfluorene (λPL=439 nm) with (x, y)=(0.23, 0.30), Tc=14395 K and Ra=65.7; and (iii) layer-by-layer deposition of yellow, green and red NCs (λPL=580, 540 and 620 nm) and blue polyfluorene (λPL=439 nm) with (x, y)=(0.38, 0.39), Tc=4052 K and Ra= 83.0. The CRI is demonstrated to be well controlled and significantly improved by increasing multi-chromaticity of the NC and polymer emitters.
- PACS
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85.60.Bt Optoelectronic device characterization, design, and modeling
78.55.Kz Solid organic materials
- Subjects
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Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Optics, quantum optics and lasers
- Dates
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Issue 10 (October 2007)
Received 29 May 2007
Published 5 October 2007
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White light generation tuned by dual hybridization of nanocrystals and conjugated polymers
Hilmi Volkan Demir et al 2007 New J. Phys. 9 362
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