Materials for optoelectronic devices
View Patent ↗Energy efficient optoelectronic devices include an electroluminescent layer containing a polymer made up of structural units of formula I and II; wherein R 1 and R 2 are independently C 22-44 hydrocarbyl, C 22-44 hydrocarbyl containing one or more S, N, O, P, or Si atoms, oxaalkylaryl, or a combination thereof; R 3 and R 4 are independently H, C 1-44 hydrocarbyl or C 1-44 hydrocarbyl containing one or more S, N, O, P, or Si atoms, or R 3 and R 4 , taken together, form a C 2-10 monocyclic or bicyclic ring containing up to three S, N, O, P, or Si heteroatoms; and X is S, Se, or a combination thereof.
1. An optoelectronic device having an electroluminescent layer comprising a polymer comprising structural units of formula I and II
wherein
R 1 and R 2 are independently Ar—(OCH 2 CH 2 (CH 2 ) m ) n OCH 3 ;
R 3 and R 4 are independently H, C 1-44 hydrocarbyl or C 1-44 hydrocarbyl containing one or more S, N, O, P, or Si atoms, or R 3 and R 4 , taken together, form a C 2-10 monocyclic or bicyclic ring containing up to three S, N, O, P, or Si heteroatoms;
X is S, Se, or a combination thereof;
m is 0 or 1; and
n ranges between about 20 and about 500.
2. An optoelectronic device according to claim 1 , wherein X is S.
3. An optoelectronic device according to claim 1 , wherein X is Se.
4. An optoelectronic device according to claim 1 , wherein the structural unit of formula I is
wherein R 1a and R 2a are independently —(OCH 2 CH 2 (CH 2 ) m ) n OCH 3 .
5. An optoelectronic device according to claim 1 , wherein the structural unit of formula I is
wherein
PEG is —CH 2 CH 2 (OCH 2 CH 2 ) n OCH 3 ; and
n ranges between about 20 and about 100.
6. An optoelectronic device according to claim 1 , wherein the structural unit of formula II is
7. An optoelectronic device according to claim 1 , wherein the structural unit of formula II is
8. An optoelectronic device according to claim 1 , wherein the structural unit of formula II is
9. An optoelectronic device according to claim 1 , additionally comprising an iridium-containing organometallic compound.
10. An optoelectronic device according to claim 9 , wherein the iridium-containing organometallic compound is blended with the polymer.