Patent ID: 7807992

Claim:
An electronic device comprising: a hole transport layer having an ionization potential IP HT , and an electron affinity EA HT , a photoactive layer, and an electron transport layer having an ionization potential IP ET , and an electron affinity EA ET , wherein the photoactive layer comprises: a host having an ionization potential IP H and an electron affinity EA H , a first photoactive material having a peak wavelength λ1, an emission color with coordinates x1 and y1, an ionization potential IP P1 and an electron affinity EA P1 , and a second photoactive material, having a peak wavelength λ2, an emission color with coordinates x2 and y2, an ionization potential IP P2 and an electron affinity EA P2 ; wherein: when λ1 is 570 to 650 nm: λ1-λ2 is less than 20 nm, absolute value, x1 and x2 are 0.6-0.7, and y1 and y2 are 0.28-0.38; when λ1 is 500 to 569 nm: λ1-λ2 is less than 15 nm, absolute value, x1 and x2 are 0.2-0.35, and y1 and y2 are 0.58-0.75; when λ1 is 440 to 499 nm: λ1-λ2 is less than 10 nm, absolute value, x1 and x2 are 0.1-0.2, and y1 and y2 are 0.05-0.25, and further wherein IP P1 -IP P2 >0.1 eV, absolute value, EA P1 -EA P2 >0.1 eV, absolute value.