A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy of no more than 0.8 and wherein a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone.

A high-sensitivity, high-selectivity and portable detection method for trace uranyl ion is described. The method has an ultralow detection limit of 11 pM/2.6 ppt and is useful in precise monitoring of the uranium content in agricultural and sideline products, foods, environments and so on. The test instrument is miniaturized and low in cost to achieve high-precision portable measurement in the field. A conjugated polymer with aggregation-induced emission (AIE) activity is synthesized, and prepared into Pdots, and a uranyl-responsive electrochemiluminescence (ECL) probe is developed by modifying the Pdots with DNA or RNA, which serves as an adsorption ligand of uranyl ion. The probe exhibits good biocompatibility. The ECL technology can be used in uranyl ion detection and the method has extremely high sensitivity. A uranyl ion probe with AIE activity is also disclosed, which can be applied in portable precise monitoring of trace uranyl ion by means of the ECL technology.

A light emitting device contains an anode, a cathode, and two organic layer respectively containing metal complexes represented by formulas (1) and (2).

##STR00001##

M.sup.1 and M.sup.2 represent an iridium atom; n.sup.1 and n.sup.3 represent an integer of 1 or more; n.sup.2 and n.sup.4 represent an integer of 0 or more; Ring R.sup.1A represents a triazole ring; Ring R.sup.2 represents an aromatic hydrocarbon ring; E.sup.1, E.sup.2 and E.sup.11A to E.sup.13A represent a nitrogen or a carbon atom; R.sup.11A to R.sup.13A represent a substituent. At least one of E.sup.11A to E.sup.13A is a nitrogen atom, and at least one of R.sup.11A to R.sup.13A bonding to the nitrogen atom is a group represented by (Ar-1A). E.sup.L represents a carbon atom; Ring L.sup.1 represents a 6-membered aromatic hetero ring; Ring L.sup.2 represents an aromatic hydrocarbon ring; and A.sup.1-G.sup.1-A.sup.2 and A.sup.3-G.sup.2-A.sup.4 represent bidentate ligands.

##STR00002##

Ring A represents an aromatic hydrocarbon ring with substituent R.sup.2.

A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy of no more than 0.8 and wherein a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone.

An organic metal complex as shown by general formula (I) or (II), wherein the ring containing Ar.sup.1 is preferably a N-hetero six-membered aromatic ring, and a polymer, a mixture, a composition and an organic electronic device comprising the complex and a use thereof. The organic electronic device, particularly an organic light emitting diode, and the use thereof in display and illumination technologies. By optimizing the device structure and changing the concentration of the metal complex in a matrix, the best performances of the device can be attained, an OLED device with a high efficiency, high luminance and high stability is achieved, and a relatively good material option is provided for full-colour display and illumination applications.

This application discloses a white-light hyperbranched conjugated polymer, a method for preparing the same and its use. The polymer uses a red phosphorescent Ir(III) complex as a core and polyfluorene derivative blue fluorescent materials as a framework which either contains or does not contain carbazole derivatives, and the white light hyperbranched polymers realize white-light emission by adjusting the content of the red phosphorescent Ir(III) complex connected using the complementation of blue and red color. The electroluminescent spectrum of the conjugated polymer in the present application covers the whole visible light emission area and is close to the pure white light emission, by which the conjugated polymer could be used as a material used in light-emitting layer to prepare the organic electroluminescent devices.

A composition suitable for use in an organic light-emitting layer (103) of an organic light-emitting device having an anode (101) and a cathode (105), the composition comprising a fluorescent light-emitting material, a first triplet-accepting material and a second triplet-accepting material that is different from the first triplet-accepting material. The fluorescent light-emitting material may be a repeat unit of a light-emitting polymer, and the first and second triplet-accepting materials may independently be repeat units of the light-emitting polymer or may be mixed with the fluorescent light-emitting material.

A composition is provided, including one or more quantum dots and at least one organic emitter. Further, a formulation including the composition, a use of the formulation and a device comprising the composition or formulation is provided.

A compound of formula (I): wherein M is a transition metal; Ar.sup.1 is a 5 or 6 membered heteroaryl ring or a polycyclic heteroaromatic group; Ar.sup.2 is a polycyclic group comprising two or more rings selected from aromatic and heteroaromatic rings; Ar.sup.1 and Ar.sup.2 may be linked by a direct bond or divalent linking group; L is a ligand; x is at least 1; a, b and y are each 0 or a positive integer; R.sup.1, R.sup.2 and R.sup.3 are each independently a substituent; and (i) Ar.sup.1 is a polycyclic heteroaromatic group; or (ii) Ar.sup.1 is a 5 or 6 membered heteroaryl ring and Ar.sup.2 is a polycyclic group comprising at least 3 rings selected from aromatic and heteroaromatic rings. The compound may be used as an infra-red emitting material of an organic light-emitting device.

##STR00001##

Light-Emitting Compound A composition comprising a light-emitting compound having a peak wavelength of at least 650 nm and a material comprising a group of formula (I): wherein Ar.sup.1, Ar.sup.2 and Ar.sup.3 in each occurrence are independently selected from a C.sub.6-20 aromatic group and a 6-20 membered heteroaromatic group of C and N ring atoms and at least one of Ar.sup.1, Ar.sup.2 and Ar.sup.3 is a 6-20 membered heteroaromatic group of C and N ring atoms; x, y and z are each independently at least 1; n, m and p are each independently 0 or a positive integer; and R.sup.1, R.sup.2 and R.sup.3 in each occurrence is independently a substituent or a single bond to a polymer chain, wherein the group of formula (I) has no more than 3 single bonds to a polymer chain. The composition may be used in the light-emitting layer of an infrared organic light-emitting device.

##STR00001##