Quantum dot-containing compositions including an emission stabilizer, products including same, and method

Abstract

The present invention relates to a composition including quantum dots and an emission stabilizer, products including same, and methods, including methods for improving, or enhancing the emission stability of quantum dots. Inclusion of an emission stabilizer in a composition can improve or enhance the stability of at least one emissive property of the quantum dots in the composition against degradation compared to a composition that is the same in all respects except that it does not include the emission stabilizer. Examples of such emissive properties include, by way of example only, lumen output, lumen stability, color point (e.g., CIE x, CIE y) stability, wavelength stability, FWHM of the major peak emission, absorption, solid state EQE, and quantum dot emission efficiency.

What is claimed is: 
     
         1 . A light-emitting device comprising a light-emitting element and an optical material arranged to receive and convert at least a portion of light emitted by the light emitting element from a first emission wavelength to one or more predetermined wavelengths, wherein the optical material comprises a composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer is present in an amount from about 0.01 to about 99 weight percent of the composition. 
     
     
         2 . The light-emitting device in accordance with  claim 1 , wherein quantum dots further comprise one or more ligands attached to a surface thereof. 
     
     
         3 . The light-emitting device in accordance with  claim 1 , wherein the emission stabilizer comprises an aliphatic moiety. 
     
     
         4 . The light-emitting device in accordance with  claim 1 , wherein the emission stabilizer comprises an aliphatic phosphate-based additive. 
     
     
         5 . The light-emitting device in accordance with  claim 1 , wherein the emission stabilizer comprises an aliphatic phosphine oxide-based additive. 
     
     
         6 . The light-emitting device in accordance with  claim 4 , wherein the phosphate-based additive comprises at least one of potassium octyl phosphate, potassium nonyl phosphate, potassium decyl phosphate, potassium undecyl phosphate, potassium lauryl phosphate, potassium myristyl phosphate, potassium cetyl phosphate, potassium stearyl phosphate, dicetyl phosphate, ceteth-10 phosphate, ceteth-20 phosphate, or ceteth-30 phosphate. 
     
     
         7 . The light-emitting device in accordance with  claim 5 , wherein the aliphatic phosphine oxide-based emission stabilizer additive comprises a substituted or unsubstituted aliphatic phosphine oxide. 
     
     
         8 . The light-emitting device in accordance with  claim 1 , wherein the composition further includes a host material. 
     
     
         9 . The light-emitting device in accordance with  claim 1  wherein the optical material encapsulates at least the light emitting-surface of the light-emitting element. 
     
     
         10 . The light-emitting device in accordance with  claim 1  wherein the optical material is spaced from the light emitting-surface of the light-emitting element. 
     
     
         11 . A display comprising a composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer is present in an amount from about 0.01 to about 99 weight percent of the composition. 
     
     
         12 . The display in accordance with  claim 11 , wherein quantum dots further comprise one or more ligands attached to a surface thereof. 
     
     
         13 . The display in accordance with  claim 11 , wherein the emission stabilizer comprises an aliphatic moiety. 
     
     
         14 . The display in accordance with  claim 11 , wherein the emission stabilizer comprises an aliphatic phosphate-based additive. 
     
     
         15 . The display in accordance with  claim 11 , wherein the emission stabilizer comprises an aliphatic phosphine oxide-based additive. 
     
     
         16 . The display in accordance with  claim 14 , wherein the phosphate-based additive comprises at least one of potassium octyl phosphate, potassium nonyl phosphate, potassium decyl phosphate, potassium undecyl phosphate, potassium lauryl phosphate, potassium myristyl phosphate, potassium cetyl phosphate, potassium stearyl phosphate, dicetyl phosphate, ceteth-10 phosphate, ceteth-20 phosphate, or ceteth-30 phosphate. 
     
     
         17 . The display in accordance with  claim 15 , wherein the aliphatic phosphine oxide-based emission stabilizer additive comprises a substituted or unsubstituted aliphatic phosphine oxide. 
     
     
         18 . The display in accordance with  claim 11 , wherein the composition further includes a host material. 
     
     
         19 . A display including a backlight member including a plurality of light-emitting diodes and an optical material arranged to receive and convert at least a portion of light emitted by at least a portion of the light-emitting diodes from a first emission wavelength to one or more predetermined wavelengths, wherein the optical material comprises a composition comprising emissive quantum dots and an emission stabilizer, wherein the emission stabilizer is present in an amount from about 0.01 to about 99 weight percent of the composition. 
     
     
         20 . The display in accordance with  claim 19 , wherein the display comprises a liquid crystal display.