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    • 1. 发明申请
    • PHOSPHORESCENT EMITTERS AND EXTRINSIC METHOD FOR INCREASING STABILITY THEREOF
    • WO2019028243A1
    • 2019-02-07
    • PCT/US2018/044988
    • 2018-08-02
    • RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY
    • O'CARROLL, Deirdre
    • H01J1/304H01J9/02
    • H01L51/5028H01L51/0035H01L51/0072H01L51/0085H01L51/5016H01L51/502H01L51/5056H01L51/5072H01L51/5088H01L51/5092H01L51/5096H01L51/5206H01L51/5221H01L2251/301H01L2251/303
    • Light-emitting devices having an emitting layer containing a light-emitting organic or organometallic material and a nanostructure, the nanostructure having strong local electric fields at visible electromagnetic wavelengths that spectrally and spatially overlap with the light-emitting material. The spectral and spatial overlap of the electric fields of the nanostructure with the light emitting material uses high LDOS provided by the nanostructures to enable excited triplet electronic states in the material to emit light faster than without the nanostructure. This faster light emission from triplet-excited states leads to more stable emission from the light emitting material because it prevents buildup of triplet-excited states, which ordinarily can lead to quenching of light emission from the light emitting material. Among the many different possibilities contemplated, the nanostructure may advantageously be made of a dielectric material or a plasmonic metal material, such as SiO 2 , TiO 2 , ZnO, Al or Ag. It is further contemplated that the light-emitting material be capable of exhibiting at least one of phosphorescence or thermally-assisted delayed fluorescence. Many light- emitting materials, including blue light emitters, may be utilized, and may also be doped into a host material. It is still further contemplated that the nanostructure may be a nanoparticle, such as a sphere or rod, or a metasurface composed of a 2D periodic or aperiodic array of nanostructures, and the nanostructure may be on either side of the light-emitting material, or may be surrounded by or embedded in the host material. The light-emitting device may also advantageously include other layers, including but not limited a hole transport layer, a hole blocking layer, an electron transport layer, a hole injection layer, or an electron injection layer. Further, the device may also be configured for use in various applications, including but not limited to bioimaging, photochemistry, and single molecule spectroscopy.