US 12,250,870 B2
Light emitting device and production method thereof, and composition for light emitting device and production method thereof
Toshiaki Sasada, Tsukuba (JP); and Ryuji Matsumoto, Nomi (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/442,587
Filed by Sumitomo Chemical Company, Limited, Tokyo (JP)
PCT Filed Mar. 16, 2020, PCT No. PCT/JP2020/011386
§ 371(c)(1), (2) Date Sep. 23, 2021,
PCT Pub. No. WO2020/203212, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-066199 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0190248 A1, Jun. 16, 2022
Int. Cl. H01L 51/50 (2006.01); C07C 15/28 (2006.01); C07D 409/14 (2006.01); C07F 5/02 (2006.01); C09K 11/06 (2006.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 50/12 (2023.01)
CPC H10K 85/322 (2023.02) [C07C 15/28 (2013.01); C07D 409/14 (2013.01); C07F 5/027 (2013.01); C09K 11/06 (2013.01); H10K 85/626 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); C07C 2603/24 (2017.05); C09K 2211/1007 (2013.01); C09K 2211/1011 (2013.01); C09K 2211/1018 (2013.01); H10K 50/121 (2023.02)] 23 Claims
 
1. A light emitting device comprising
an anode,
a cathode, and
an organic layer disposed between said anode and said cathode and containing a composition for light emitting device,
wherein
said composition for light emitting device contains two or more compounds (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring, and
said compound (B) contains a compound (B1) and a compound (B2) satisfying at least one of the formula (M-1) and the formula (M-2):
EB1<EB2  (M-1)
AB1<AB2  (M-2)
wherein, EB1 represents the maximum peak wavelength [nm] of the emission spectrum at 25° C. of the compound (B1), EB2 represents the maximum peak wavelength [nm] of the emission spectrum at 25° C. of the compound (B2), AB1 represents the peak wavelength [nm] at the lowest energy side of the absorption spectrum at 25° C. of the compound (B1), and AB2 represents the peak wavelength [nm] at the lowest energy side of the absorption spectrum at 25° C. of the compound (B2).
 
19. A method for producing a composition for light emitting device, comprising
a preparation step of preparing a compound (B1) having a condensed hetero ring skeleton (b1) containing a boron atom and a nitrogen atom in the ring,
a sorting step of sorting a compound (B2) having a condensed hetero ring skeleton (b2) containing a boron atom and a nitrogen atom in the ring and in which the maximum peak wavelength of the emission spectrum at 25° C. is larger than the maximum peak wavelength of the emission spectrum at 25° C. of said compound (B1) and/or the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. is smaller than the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. of said compound (B1), and
a production step of mixing the compound (B1) prepared in said preparation step and the compound (B2) sorted in said sorting step to obtain a composition for light emitting device.