Invention summary:
Rutgers researchers have developed a new type of semiconductor materials that are capable of generating white light directly from a single material so that there is no need for using complex mixing/doping processes.
Light emitting diodes (LEDs) are energy-saving lighting devices that are fast growing in recent years. LEDs utilize semiconductor materials to convert electricity to light more effectively than conventional lighting sources. These devices are capable of generating about twice as much light per watt as incandescent light bulbs and their lifetime is about 50 times longer. White-light LEDs have great potential for general lighting applications. Typically they are produced by combination of red, green and blue (RGB) LEDs. Phosphor conversion is another way used to produce white LEDs, in which white light is generated by coating a blue or near-UV LED with a yellow or multichromatic phosphor. However, such processes are often associated with complex doping schemes, and significant reduction of device efficiency due to problems such as self-absorption, relatively low light capture efficiency of phosphores or nonradiative carrier losses.
Market application: Lighting
Advantages: Since the new materials generate direct white light, complex doping/combination processes used at the present time to make LEDs can be avoided. Consequently they will be less expensive. In addition the optical properties of these materials can be tuned systematically to enhance lighting power and efficiency, making them possible to be used in general lighting applications.
IP status: Provisional application filed.
Select publications:
1. Li, J.; Bi, W.-H.; Ki, W.; Huang, X.-Y.; Reddy, S. “Nanostructured Crystals: Unique Hybrid Semiconductors Exhibiting Nearly Zero and Tunable Uniaxial Thermal Expansion Behavior”, J. Am. Chem. Soc., 2007, 129, 14140.
2. Lee, J. Y.; Olson, D. H.; Pan, L.; Emge, T. J.; Li, J. “[M(bdc)(ted)0.5]•2DMF•0.2H2O (M = Zn, Cu): Microporous Metal Organic Frameworks with High Gas Sorption and Separation Capacity”, Adv. Func. Mater., 2007, 17, 1255-1262.
3. Huang, X. -Y.; Li, J. “From Single to Multiple Atomic Layers: A Unique Approach to the Systematic Tuning of Structures and Properties of Inorganic-Organic Hybrid Nanostructured Semiconductors”, J. Am. Chem. Soc., 2007, 129, 3157-3162.
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