Time-Resolved Photoluminescence Studies of Transparent Hybrid Nanomaterials for Tunable Energy-Efficient Light Emitting Materials and Devices

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Consumers and industry are seeking safe, durable, energy-efficient alternatives to traditional incandescent light bulbs. Although compact fluorescent lamps (CFLs) are comparatively efficient, they contain mercury, which requires special handling for disposal and in the case of bulb breakage. Light emitting diodes (LEDs) are a safer, more efficient and longer lasting alternative to CFLs. However, manufacturing efficient white LEDs is complicated and expensive. The fabrication of quasi-white LEDs is currently based on combining LEDs of different colours, or using a mixture of different phosphors (often containing expensive rare-earth elements). We designed and prepared low-cost high-efficiency organic-nanocrystal hybrid material whose illumination can tuned to any colour in the visible range, including pure white light, and which can be processed into light emitting structures and devices from liquid (i.e. solution) or solid (i.e. powder). The obtained hybrid nanomaterial acts as a single illumination entity, rather than a mixture, and provides a homogeneous and uniform white light emission.