US 12,089,437 B2
Flexible electroluminescent devices
Ruiqing Ma, Morristown, NJ (US); Jason Hartlove, Los Altos, CA (US); and Charles Hotz, San Rafael, CA (US)
Assigned to SHOEI CHEMICAL INC., Tokyo (JP)
Appl. No. 17/604,684
Filed by Shoei Chemical Inc., Tokyo (JP)
PCT Filed Apr. 17, 2020, PCT No. PCT/US2020/028718
§ 371(c)(1), (2) Date Oct. 18, 2021,
PCT Pub. No. WO2020/214930, PCT Pub. Date Oct. 22, 2020.
Claims priority of provisional application 62/836,286, filed on Apr. 19, 2019.
Prior Publication US 2022/0209199 A1, Jun. 30, 2022
Int. Cl. H10K 50/858 (2023.01); H10K 50/115 (2023.01); H10K 50/844 (2023.01); H10K 50/87 (2023.01); H10K 71/00 (2023.01); H10K 77/10 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/858 (2023.02) [H10K 50/115 (2023.02); H10K 71/00 (2023.02); H10K 50/844 (2023.02); H10K 50/87 (2023.02); H10K 77/111 (2023.02); H10K 2102/311 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A flexible electroluminescent (FEL) device comprising:
a device stack comprising a quantum dot (QD) film configured to generate a first light having a first peak wavelength;
a flexible substrate configured to support the device stack and emit a first portion of the first light;
an encapsulation layer disposed on the device stack, wherein the encapsulation layer is configured to provide mechanical and environmental protection to the FEL device from moisture or oxygen;
an outcoupling layer disposed on the flexible substrate, wherein the outcoupling layer is configured to:
prevent total internal reflection of a second portion of the first light within the flexible substrate and extract the second portion from the flexible substrate; or
eliminate air gaps at an interface between the outcoupling layer and a surface to be illuminated by the extracted second portion in response to the FEL device being substantially conformally placed on the surface; and
a color processing layer interposed between the flexible substrate and the outcoupling layer, wherein the color processing layer is configured to down convert the first light to generate a second light having a second peak wavelength different from the first peak wavelength.