Patent ID: 11968896
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC H  G | IPC G  H

Claim 11:
12. The light-emitting device of claim 1, wherein:
each of R1, R2, R3, and R4 is not hydrogen;
R1 is hydrogen, and at least one selected from R2, R3, and R4 is not hydrogen;
R2 is hydrogen, and at least one selected from R1, R3, and R4 is not hydrogen;
R3 is hydrogen, and at least one selected from R1, R2, and R4 is not hydrogen;
R4 is hydrogen, and at least one selected from R1, R2, and R3 is not hydrogen; or
each of R1, R2, R3, and R4 is hydrogen.