Light-emitting devices and displays with improved performance

A light-emitting device comprising:

• a first electrode comprising an anode opposite to a second electrode comprising a cathode;
• a hole injection layer adjacent to the first electrode;
• and
• an emissive layer of inorganic semiconductor nanocrystals disposed between the hole injection layer and the second electrode, the inorganic semiconductor nanocrystals comprising a plurality of semiconductor nanocrystals capable of emitting light upon excitation,
• wherein the device is capable of emitting light with a brightness of at least 100 nits when driven at a voltage less than or equal to 4 volts.

A light-emitting device comprising:

• a first electrode comprising an anode opposite a second electrode comprising a cathode;
• a hole injection layer adjacent the first electrode;
• and
• an emissive layer of inorganic semiconductor nanocrystals disposed between the hole injection layer and the second electrode, the inorganic semiconductor nanocrystals comprising a plurality of semiconductor nanocrystals capable of emitting light upon excitation,
• wherein at least a portion of the semiconductor nanocrystals comprise a core including a first semiconductor material comprising a ternary semiconductor material and a shell overcoating the core, the shell comprising a second semiconductor material, and
• wherein the ternary semiconductor material comprises a Group II-VI compound, a Group III-V compound, or a combination thereof.

A light-emitting device comprising:

• a first electrode comprising an anode opposite a second electrode comprising a cathode;
• a hole injection layer adjacent to the first electrode;
• and
• an emissive layer of inorganic semiconductor nanocrystals disposed between the hole injection layer and the second electrode, the inorganic semiconductor nanocrystals comprising a plurality of semiconductor nanocrystals capable of emitting light upon excitation,
• wherein the device emits light having a CIE color coordinate of x greater than 0.63.