Compositions for electronic applications
This invention relates to a composition including (a) a dopant, (b) a first host having at least one unit of Formula I, and (c) a second host compound. Formula I has the structure where Q is a fused ring linkage having the formula In Formula I: R 1 is the same or different at each occurrence and is D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, vinyl, or allyl; R 2 is the same or different at each occurrence and is H, D, alkyl, or aryl, or both R 2 are an N-heterocycle; R 3 is the same or different at each occurrence and is H, D, cyano, alkyl or aryl; and a is the same or different at each occurrence and is an integer from 0-4.
1. A composition comprising (a) a dopant capable of electroluminescence having an emission maximum between 380 and 750 nm, (b) a host compound having at least one unit of Formula II(a)
wherein:
R 1 is the same or different at each occurrence and is D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, styryl, vinyl, or allyl;
R 3 is the same or different at each occurrence and is H, D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, styryl, vinyl, or allyl;
R 4 is the same or different at each occurrence and is an O-heterocycle, an S-heterocycle, or a deuterated analog thereof;
a is the same or different at each occurrence and is an integer from 0-4;
b is the same or different at each occurrence and is an integer from 1-5; and
(c) a second host compound which is an indolocarbazole or a deuterated analog thereof.
2. The composition of claim 1 , wherein the first host compound is at least 10% deuterated.
3. The composition of claim 1 , wherein R 3 is H or D.
4. The composition of claim 1 , wherein the second host is an indolocarbazole having an N-heterocycle substituent, or a deuterated analog thereof.
5. The composition of claim 1 , wherein the second host material has Formula V
wherein:
Q is a fused ring linkage having the formula
R 1 is the same or different at each occurrence and is D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, vinyl, or allyl;
R 3 is the same or different at each occurrence and is H, D, cyano, alkyl, or aryl;
R 4 is the same or different at each occurrence and is D, aryl, silyl, alkoxy, aryloxy, cyano, vinyl, allyl, dialkylamino, diarylamine, carbazole, pyridine, pyrimidine, triazine, dibenzothiophene, dibenzopyran, or a deuterated analog thereof;
R 8 is the same or different at each occurrence and is H, D, alkyl, or aryl, or R 8 may form a fused 5- or 6-membered ring;
X is the same or different at each occurrence and is CH or N, with the proviso that at least one X is N;
a is the same or different at each occurrence and is an integer from 0-4; and
b is the same or different at each occurrence and is an integer from 0-5.
6. An organic electronic device comprising a first electrical contact layer, a second electrical contact layer, and a photoactive layer therebetween, wherein the photoactive layer comprises (a) a dopant capable of electroluminescence having an emission maximum between 380 and 750 nm, (b) a first host compound having at least one unit of Formula II(a)
wherein:
R 1 is the same or different at each occurrence and is D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, styryl, vinyl, or allyl;
R 3 is the same or different at each occurrence and is H, D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, styryl, vinyl, or allyl;
R 4 is the same or different at each occurrence and is an O-heterocycle, an S-heterocycle, or a deuterated analog thereof;
a is the same or different at each occurrence and is an integer from 0-4;
b is the same or different at each occurrence and is an integer from 1-5; and
(c) a second host compound which is an indolocarbazole or a deuterated analog thereof.
7. The device of claim 6 , wherein the dopant is a luminescent organometallic complex.
8. The device of claim 7 , wherein the organometallic complex is a cyclometalated compex of iridium or platinum.
9. The device of claim 6 , wherein the second host is an indolocarbazole having an N-heterocycle substituent, or a deuterated analog thereof.
10. The device of claim 6 , wherein the second host material has Formula V
wherein:
Q is a fused ring linkage having the formula
R 1 is the same or different at each occurrence and is D, alkyl, aryl, silyl, alkoxy, aryloxy, cyano, vinyl, or allyl;
R 3 is the same or different at each occurrence and is H, D, cyano, alkyl, or aryl;
R 4 is the same or different at each occurrence and is D, aryl, silyl, alkoxy, aryloxy, cyano, vinyl, allyl, dialkylamino, diarylamine, carbazole, pyridine, pyrimidine, triazine, dibenzothiophene, dibenzopyran, or a deuterated analog thereof;
R 8 is the same or different at each occurrence and is H, D, alkyl, or aryl, or R 8 may form a fused 5- or 6-membered ring;
X is the same or different at each occurrence and is CH or N, with the proviso that at least one X is N;
a is the same or different at each occurrence and is an integer from 0-4; and
b is the same or different at each occurrence and is an integer from 0-5.
11. The device of claim 6 , wherein the photoactive layer consists essentially of (a) a dopant capable of electroluminescence having an emission maximum between 380 and 750 nm and (b) a first host compound having at least one unit of Formula II(a), and (c) a second host compound which is an indolocarbazole or a deuterated analog thereof.