US Patent No. 9,860,960

ORGANIC EL DISPLAY DEVICE AND METHOD FOR PRODUCTION OF THE SAME


Patent No. 9,860,960
Issue Date January 02, 2018
Title Organic El Display Device And Method For Production Of The Same
Inventorship Toshiki Matsumoto, Kanagawa (JP)
Tadahiko Yoshinaga, Kanagawa (JP)
Assignee JOLED INC., Tokyo (JP)

Claim of US Patent No. 9,860,960

1. An organic electroluminescence display device comprising:
a substrate;
a plurality of lower electrodes on said substrate, each lower electrode corresponding to a respective red, green or blue light
organic electroluminescence element;

a respective hole injecting layer on each lower electrode containing a first low-molecular weight material;
a respective hole transporting layer on each hole injecting layer;
a respective red light organic light emitting layer, green light organic light emitting layer, and blue light organic light
emitting layer on each hole transporting layer and corresponding to a respective red, green or blue light organic electroluminescence
element;

an electron transporting layer formed as a common layer on said organic light emitting layers associated with said plurality
of lower electrodes;

an electron injecting layer on said electron transporting layer and formed as a layer in common to all of the light emitting
layers;

an upper electrode on said electron injecting layer and formed as a layer in common to all of the light emitting layers; and
a respective partition wall associated with each lower electrode and being separate from said hole injecting layer, said hole
transporting layer, said electron transporting layer, and said electron injecting layer, said partition wall separating said
hole injecting layer, said hole transporting layer, and said organic light emitting layer for each lower electrode,

wherein,
each of the red light organic emitting layer, a green light organic emitting layer, and a blue light organic emitting layer
comprises (a) a polymeric guest material and (b) a second low-molecular weight host material with a molecular weight from
300 to 10,000 and having an energy value of a lowest unoccupied molecular orbital (i) greater than an energy value of the
lowest unoccupied molecular orbital of the red light organic emitting layer and the green light organic emitting layer and
(ii) less than an energy value of the lowest unoccupied orbital layer of the electron transporting layer,

the weight ratio range of the polymeric guest material to the second low-molecular weight host material is from 20:1 to 1:1,
both inclusive,

the electron transporting layer comprises a third low molecular weight material, and
the first low molecular weight material can be the same as or different from the second low-molecular weight host material.