US 11,943,985 B2
Light-emitting device and light-emitting display device including the same
Jin Ho Park, Goyang-si (KR); Kyu Il Han, Paju-si (KR); Chang Hwan Kwak, Seoul (KR); Dong Hyeok Lim, Paju-si (KR); Hwa Yong Shin, Goyang-si (KR); and Ji Hyung Lee, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Jun. 7, 2021, as Appl. No. 17/341,051.
Claims priority of application No. 10-2020-0183667 (KR), filed on Dec. 24, 2020.
Prior Publication US 2022/0208876 A1, Jun. 30, 2022
Int. Cl. H10K 59/35 (2023.01); H10K 50/12 (2023.01); H10K 50/18 (2023.01)
CPC H10K 59/353 (2023.02) [H10K 50/12 (2023.02); H10K 50/18 (2023.02)] 17 Claims
OG exemplary drawing
 
1. A light-emitting display device comprising:
a substrate having a plurality of subpixels;
an anode at each of the plurality of subpixels;
a cathode over the plurality of subpixels;
a charge generation layer between the anode and the cathode;
a first stack between the anode and the charge generation layer; and
a second stack between the charge generation layer and the cathode, the second stack overlapping the first stack,
wherein at least one subpixel of the plurality of subpixels comprises a first emissive layer having a first host and a first fluorescent dopant in the first stack, and a second emissive layer having a second host and a second fluorescent dopant in the second stack,
the second emissive layer configured to emit a same color-based light as the first emissive laver,
wherein the second emissive layer overlaps the first emissive layer and further includes a non-fluorescent dopant than that of the first emissive layer,
wherein the non-fluorescent dopant in the second emissive layer has an emission peak of a longer wavelength by approximately 1 nm or more to approximately 30 nm or less than an emission peak of the first fluorescent dopant in the first emissive layer, and
wherein the second host has a photoluminescence (PL) spectrum that overlaps a PL spectrum of the second fluorescent dopant, and the second host has a higher triplet state than that of the non-fluorescent dopant.