US5698048A
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Photoresponsive materials
Assignee: Cambridge Display Technology Ltd
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Filing: 1995-12-08
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Granted: 1997-12-16
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Expires: 2015-12-08
Abstract
Abstract A photoresponsive material comprises molecular or polymeric semiconductors in which photogeneration of separated charge carriers proceeds substantially via an intermediate stage of a triplet exciton, where the generation of the triplet exciton may be facilitated by the presence of elements of high atomic number, and in which the generation of separated charges from the intermediate triplet excited states is facilitated by the presence of at least two semiconductive components, one of which is of high electron affinity and able to accept electrons, and the other of which is of low ionisation potential and therefore able to accept positive charge carriers, the difference between the electron affinity of the former and the ionisation potential of the latter being sufficiently low so as to allow the ionisation of a triplet exciton which is present on either of the two aforementioned semiconductive components or on a third component. The provision of contact electrodes allows charge to be collected by an external electrical circuit and allows light to be incident on the active photoresponsive material.
Inventors
- 👤 Richard Friend
- 👤 Annette Kohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:35
CPC Classifications
H; H10; H10K; H10K85/00; H10K85/30; H10K85/341; H10K85/346; B; B82; B82Y; B82Y10/00; H10K85/10; H10K85/111; H10K30/00; H10K30/50; H10K71/00; H10K71/40; H10K85/20; H10K85/211; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/549; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
72 words
A photoresponsive material comprising: an organometallic complex comprising a transition metal; and a fullerene, a conjugated polymer with an electron withdrawing group in the main chain, a conjugated polymer with an electron withdrawing group attached as a side chain, a polymer comprising an electron withdrawing oxazole group, a polymer comprising an electron withdrawing oxadiazole group, a molecule comprising an electron withdrawing oxazole group, or a molecule comprising an electron withdrawing oxadiazole group.
Claim 2
Dependent Claim
72 words
A photoresponsive material comprising: an organometallic complex comprising a transition metal; and a fullerene, a conjugated polymer with an electron withdrawing group in the main chain, a conjugated polymer with an electron withdrawing group attached as a side chain, a polymer comprising an electron withdrawing oxazole group, a polymer comprising an electron withdrawing oxadiazole group, a molecule comprising an electron withdrawing oxazole group, or a molecule comprising an electron withdrawing oxadiazole group.
Claim 3
Dependent Claim
18 words
A photoresponsive material according to claim 1, wherein the organometallic complex comprising a transition metal is a semiconductor.
Claim 4
Dependent Claim
12 words
A photoresponsive material according to claim 2, wherein the semiconductor is Pt-poly-yne.
Claim 5
Dependent Claim
16 words
A photoresponsive material according to claim 2, wherein the fullerene is C 60 /C 70 .
Claim 6
Dependent Claim
28 words
A photoresponsive material according to claim 2, wherein the conjugated polymer with an electron withdrawing group in the main chain is poly(pyridine), poly(pyrazine), poly(pyridine vinylene), or poly(pyrazine vinylene).
Claim 7
Dependent Claim
33 words
A photoresponsive material according to claim 2, wherein the conjugated polymer with an electron withdrawing group attached as a side chain is poly (p-phenylene vinylene) with nitrile groups attached to the main chain.
Claim 8
Dependent Claim
15 words
A photoresponsive material according to claim 1, wherein the fullerene is fullerene C 60 .
Claim 9
Dependent Claim
33 words
A photoresponsive material according to claim 1, wherein the organometallic complex comprising a transition metal comprises a square planar coordinated complex with four ligands, at least one of which is an acetylenic ligand.
Claim 10
Dependent Claim
13 words
A photoresponsive material according to claim 8, wherein the transition metal is platinum.
Claim 11
Dependent Claim
92 words
A photoresponsive device comprising: a first electrode, a second electrode; and arranged between the first electrode and the second electrode a photoresponsive material comprising: an organometallic complex comprising a transition metal; and a fullerene, a conjugated polymer with an electron withdrawing group in the main chain, a conjugated polymer with an electron withdrawing group attached as a side chain, a polymer comprising an electron withdrawing oxazole group, a polymer comprising an electron withdrawing oxadiazole group, a molecule comprising an electron withdrawing oxazole group, or a molecule comprising an electron withdrawing oxadizole group.
Claim 12
Dependent Claim
92 words
A photoresponsive device comprising: a first electrode, a second electrode; and arranged between the first electrode and the second electrode a photoresponsive material comprising: an organometallic complex comprising a transition metal; and a fullerene, a conjugated polymer with an electron withdrawing group in the main chain, a conjugated polymer with an electron withdrawing group attached as a side chain, a polymer comprising an electron withdrawing oxazole group, a polymer comprising an electron withdrawing oxadiazole group, a molecule comprising an electron withdrawing oxazole group, or a molecule comprising an electron withdrawing oxadizole group.
Claim 13
Dependent Claim
15 words
A device according to claim 10, wherein the first electrode comprises a transparent conductive layer.
Claim 14
Dependent Claim
29 words
A device according to claim 11, wherein the transparent conductive layer is comprises indium oxide; indium/tin oxide; or a conductive polymer comprising a polyaniline, a polypyrrole, or a polythiophene.
Claim 15
Dependent Claim
14 words
A device according to claim 10, wherein the second electrode comprises a metallic layer.
Claim 16
Dependent Claim
25 words
A device according to claim 13, wherein the metallic layer comprises aluminum, magnesium, calcium, lithium, or an alloy of one of these metals with silver.
References Cited (Backward Citations)
US5171373A
Cited
WO1994005045A1
Cited
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