White light generation tuned by dual hybridization of nanocrystals and conjugated polymers

Hilmi Volkan Demir, Sedat Nizamoglu, Tuncay Ozel, Evren Mutlugun, Ilkem Ozge Huyal, Emre Sari, Elisabeth Holder, Nan Tian
2007 New Journal of Physics  
Dual 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,
more » ... , 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 (λ PL = 580 nm) and blue polyfluorene (λ PL = 439 nm) with tristimulus coordinates of (x, y) = (0.31, 0.27), correlated color temperature of T c = 6962 K and CRI of R a = 53.4; (ii) layer-by-layer assembly of yellow and green NCs (λ PL = 580 and 540 nm) and blue polyfluorene (λ PL = 439 nm) with (x, y) = (0.23, 0.30), T c = 14395 K and R a = 65.7; and (iii) layer-by-layer
doi:10.1088/1367-2630/9/10/362 fatcat:z2a2r6acmbcitl2ottgt2w7ske