White light-emitting device with improved doping

A light-emitting display including:

• a) a plurality of OLEDs that produce white light when current is driven through them, each OLED including:
• i) an anode;
• ii) a hole-transporting layer disposed over the anode;
• iii) a blue light-emitting layer disposed over the hole-transporting layer;
• iv) an electron-transporting layer disposed over the blue light-emitting layer;
• v) a cathode disposed over the electron-transporting layer;
• and
• vi) the hole-transporting layer including a host material, a yellow dopant and a red dopant;
• and
• b) an array of color filters, including red, green, and blue filters, disposed in the display, each filter corresponding to a different OLED such that the white light produced by each OLED is filtered by its corresponding filter.

A light-emitting display including:

• a) one or more OLEDs that produce white light upon passage of electrical current through the OLED(s), each OLED including:
• i) an anode;
• ii) a hole-transporting layer disposed over the anode;
• iii) a blue light-emitting layer disposed over the hole-transporting layer;
• iv) an electron-transporting layer disposed over the blue light-emitting layer;
• v) a cathode disposed over the electron-transporting layer;
• and
• vi) the hole-transporting layer including a host material, a yellow dopant and a red dopant;
• and
• b) an array of color filters, including red, green, and blue filters, disposed in the display such that the white light produced by the OLED(s) is filtered through the color filters;
• and
• c) an array of liquid-crystal light valves, each light valve corresponding to a different color filter, disposed in the array such that the white light produced by the OLED(s) and filtered by the color filter is adjusted in brightness by the liquid-crystal light valves.