US 12,295,203 B2
White organic light emitting device and process for production thereof
Konstantinos Daskalakis, Helsinki (FI); and Päivi Törmä, Espoo (FI)
Assigned to TURUN YLIOPISTO, Turun Yliopisto (FI)
Appl. No. 17/599,804
Filed by TURUN YLIOPISTO, Turun Yliopisto (FI)
PCT Filed Apr. 2, 2020, PCT No. PCT/FI2020/050214
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/201633, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 20195269 (FI), filed on Apr. 3, 2019.
Prior Publication US 2022/0165992 A1, May 26, 2022
Int. Cl. H01L 51/52 (2006.01); H10K 50/17 (2023.01); H10K 50/852 (2023.01); H10K 71/00 (2023.01); H10K 85/60 (2023.01); H10K 50/18 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/852 (2023.02) [H10K 50/171 (2023.02); H10K 71/00 (2023.02); H10K 85/615 (2023.02); H10K 85/6572 (2023.02); H10K 50/18 (2023.02); H10K 2102/00 (2023.02)] 12 Claims
OG exemplary drawing
 
1. A white organic light emitting device (WOLED) comprising
an organic light-emitting device (OLED) comprising an electroluminescent medium (ELM), and
a Bragg converter comprising pairs of alternating layers of high refractive index material and low refractive index material disposed immediately adjacent to the OLED,
wherein the ELM comprises a single organic light emitting layer (EML) that emits light of a broad range with part of its emission located at ultraviolet and blue wavelengths and the Bragg converter that converts the light from the OLED to a different color by suppressing UV radiation by its stop band and enhancing outcoupling of the red-shifted emission through Bragg modes.