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

Claim 4:
5. The light-emitting device of claim 1, wherein:
(i) X1 is O, X2 is O, X3 is O, and X4 is O;
(ii) X1 is O, X2 is O, X3 is N(R3a), and X4 is O;
(iii) X1 is N(R1a), X2 is O, X3 is O, and X4 is O;
(iv) X1 is N(R1a), X2 is O, X3 is N(R3a), and X4 is O;
(v) X1 is O, X2 is N(R2a), X3 is N(R3a), and X4 is O;
(vi) X1 is O, X2 is O, X3 is N(R3a), and X4 is N(R4a);
(vii) X1 is S, X2 is O, X3 is N(R3a), and X4 is O;
(viii) X1 is S, X2 is S, X3 is N(R3a), and X4 is N(R4a);
(ix) X1 is N(R1a), X2 is N(R2a), X3 is N(R3a), and X4 is O;
(x) X1 is N(R1a), X2 is O, X3 is N(R3a), and X4 is N(R4a);
(xi) X1 is N(R1a), X2 is S, X3 is N(R3a), and X4 is N(R4a); or
(xii) X1 is N(R1a), X2 is N(R2a), X3 is N(R3a), and X4 is N(R4a).