The invention provides a photoinduced-nonlinear-expansion coordination polymer and preparation method thereof. The coordination polymer has a chemical formula of [Zn(iba)(tkpvb)Cl].sub.n1, wherein iba represents p-iodobenzoate, tkpvb represents 1,2,4,5-tetrakis((E)-2-(4-pyridyl)vinyl)benzene, and n=3000-60000; and crystallographic parameters of: (1) crystal system: monoclinic system; (2) space group: Cc; (3) a = 28.6156(16) Å, b = 7.2901(4) Å, c = 21.5157(13) Å, β = 127.430(4)°, and V = 3574.2(4) Å.sup.3; (4) Z = 4; and (5) F(000) = 1680, R.sub.1 = 0.1363, wR.sub.2 = 0.3788, and GOF = 1.620; wherein iba represents p-iodobenzoate, tkpvb represents 1,2,4,5-tetrakis((E)-2-(4-pyridyl)vinyl)benzene, and n1=3000-60000. The preparation method of the coordination polymer of the present invention is simple, and has mild reaction conditions, and fast light conversion rate. Moreover, the coordination polymer undergoes an addition reaction, exhibits the photoinduced nonlinear expansion performance of the material, and affords a corresponding isomeric compound under the irradiation of light of various wavelengths.

In some embodiments, conjugated polymers and oligomers are described herein, which can demonstrate white light or substantially white light emission, thereby reducing or precluding reliance on layered or blended polymer constructions for organic white light emitting devices.

Composition for use in an organic light-emitting device, the composition having a fluorescent light-emitting material and a triplet-accepting material subject to the following energetic scheme: 2×T.sub.1A>S.sub.1A>S.sub.1E, or T.sub.1A+T.sub.1E>S.sub.1A>S.sub.1E in which: T1A represents a triplet excited state energy level of the triplet-accepting material; TIE represents a triplet excited state energy level of the light-emitting material; S.sub.1A represents a singlet excited state energy level of the triplet-accepting material; and S.sub.1E represents a singlet excited state energy level of the light-emitting material; and in which light emitted by the composition upon excitation includes delayed fluorescence.

Composition which may be useful in an organic light emitting diode, the composition having a fluorescent light-emitting polymer with light-emitting repeat units, and a triplet-accepting unit mixed with the light-emitting polymer.

The present invention relates to a conjugated polymer compound for a polymer solar cell donor represented by the following chemical formula 1 and a polymer solar cell comprising same:

##STR00001## (in chemical formula 1 above, n is an integer greater than or equal to 2, Ar.sub.1 and Ar.sub.2 are each independently substituted or unsubstituted thienylene, substituted or unsubstituted thieno[3,2-b]thiophene, or a bond, R.sub.1 is substituted or unsubstituted 2-thienyl or substituted or unsubstituted phenyl, R.sub.2 is hydrogen or fluorine, and R.sub.3 is 2-ethylhexyl).

The present specification provides a copolymer and an organic solar cell including the same.

The invention relates to a process for the production of an organic layer comprising regions with different electronic properties. The process is based on the use of dihydroanthracene, dihydrobenzene, benzol or fluorene precursors functionalised with at least one substituted propargyl alcohol. By subjecting these precursors to a reduction/re-aromatisation reaction and/or to a retro-Favorskii reaction one obtains small organic molecules or polymers having different electronic properties, due to the specific chemical composition generated by the different chemical reactions in which the precursors are involved. Therefore, starting from the same precursor and subjecting it alternatively to the two specified reactions, one obtains products with different electronic properties. i.e. molecules characterised by high energy levels of the highest occupied molecular orbital (HOMO), which have at least one aromatic ring substituted with at least one ethynyl group, and molecules characterised by lower energy levels of the lowest unoccupied molecular orbital (LUMO), which have at least one carbonyl functionality, preferably at least one quinone ring or at least one phenyl with at least one carbonyl functionality. The reactions are carried out in such a way that the final products are incorporated into a single organic layer.