Board of Trustees of the University of Arkansas

Najing Technology Corporation Limited

Other

David Battaglia

Xiaogang Peng

Y Andrew Wang

Jianqing Li

Yunjun Wang

Suresh Sunderrajan

Tiecheng A Qiao

Haoguo Zhu

Qiang Zhang

Kai Su

Haogua Zhu

Zhaorong Weng

Wengang Bi

Weiyong Yu

Jianquing Li

Yongqiang Andrew Wang

The present invention relates to the use of light-converting, colloidal, doped semiconductor nanocrystals to provide a new generation of high performance, low cost monochromatic and white light sources based on LEDs.

Semiconductor nanocrystals used with LED sources

The present invention provides new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core/shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.

Monodisperse core/shell and other complex structured nanocrystals and methods of preparing the same

The present invention relates to low reabsorbing semiconductor nanocrystals having, simultaneously, an emission center core surrounded by at least one absorbing shell capable of absorbing blue or purple light and a protective exterior shell. The emission center core is capable of emitting at least one different wavelength range of light. The low reabsorbing semiconductor nanocrystals demonstrate an absorbance ratio greater than or equal to 10. These low reabsorbing semiconductor nanocrystals can be used in optical applications, some of which can include, for example, light-emitting diodes, solid-state-lighting, solar cells, lasers, and biomedical tags.

Simultaneous optimization of absorption and emission of nanocrystals

The present invention relates to a light-emitting device including a light source, a first light-emitting material spaced apart from the light source, and at least one additional light-emitting material. The first light-emitting material includes low reabsorbing semiconductor nanocrystals having an emission-center core, an exterior protective shell, and at least one inner light-absorbing shell. The device is useful for efficiently producing white light having a high color rendering index.

White light emitting device

The present invention provides substantially monodisperse colloidal nanocrystals and new preparative methods for the synthesis of substantially monodisperse colloidal nanocrystals. These synthetic methods afford the ability to tune nanocrystal size and size distribution. By using non-coordinating solvents in the synthetic process, these procedures constitute easier, less expensive, safer, and more environmentally 'green' methods than those currently in use. This invention is generally applicable to any II&#x2013;VI or III&#x2013;V semiconductor material, and may be useful in generating metal-nonmetal compounds involving transition metals as well.

High quality colloidal nanocrystals and methods of preparing the same in non-coordinating solvents

Growing community of inventors

Fayetteville, AR, United States of America

David Battaglia