The present invention provides a luminescent film containing at least a phosphorescent compound and a fluorescent compound, wherein the convolution integral value J of the emission spectrum of the phosphorescent compound and the absorption spectrum of the fluorescent compound satisfies equation (1), the light emission from the fluorescent compound accounts for at least 90% of the emission spectrum of the luminescent film, and the absolute photoluminescence quantum efficiency (PLQE) of the luminescent film is represented by equation (2). Equation (1): J≥1.5×10.sup.14, Equation (2): PLQE (a film composed of a phosphorescent compound and a host compound)×0.9≤PLQE (a film containing a phosphorescent compound and a fluorescent compound) [The lowest triplet excited state of the host compound is higher than the lowest triplet excited state of the phosphorescent compound, and does not suppress the luminescent property of the phosphorescent compound.]

To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R.sup.1 to R.sup.5 each are a substituent not containing a cyano group. n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.

##STR00001##

A fluorescent dye, a preparation method and uses thereof, wherein the fluorescent dye has the advantages of sensitivity and specificity to viscosity response, low background fluorescence and the like, and can also be used as a fluorescence activated and lightened-up probe for fluorescence labeling, quantification or detection of proteins, enzymes or nucleic acids.

A fluorescent dye, a preparation method and uses thereof, wherein the fluorescent dye has the advantages of sensitivity and specificity to viscosity response, low background fluorescence and the like, and can also be used as a fluorescence activated and lightened-up probe for fluorescence labeling, quantification or detection of proteins, enzymes or nucleic acids.

The present invention relates to soluble organic compounds, to compositions comprising these compounds, to formulations comprising the compounds or compositions, and to electronic devices.

The present invention provides a mangiferin-6-O-berberine salt and a preparation method thereof, and further provides a use of the mangiferin-6-O-berberine salt for the treatment of diabetics and other diseases as an AMPK activator.

The present invention provides a mangiferin-6-O-berberine salt and a preparation method thereof, and further provides a use of the mangiferin-6-O-berberine salt for the treatment of diabetics and other diseases as an AMPK activator.

Provided are four crystal forms, A, B, C and D, of demethyleneberberine hydrochloride, and a preparation method therefor, and further provided are X-ray powder diffraction characteristic absorption peaks, infrared absorption peaks and DSC spectra of the four crystal forms. The X-ray powder diffraction characteristic diffraction peaks of the crystal forms are at about 8.205°, 8.805°, 10.817°, 14.835°, 15.479°, 16.668°, 17.492°, 18.529°, 20.656°, 21.536°, 23.538°, 25.657°, 26.192°, and 28.808°. A preparation method for the four crystal forms of the demethyleneberberine hydrochloride is also involved. The preparation method has a simple process, a high yield and a low cost; and has a high product purity and a stable quality.

A compound with which the luminance life of a light emitting device is excellent is represented by formula (1):

##STR00001##

n represents an integer of 2 or more and 20 or less, R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. Ar.sup.1 represents a mono-cyclic or condensed-cyclic arylene group, a mono-cyclic or condensed-cyclic divalent heterocyclic group or a group represented by —N(R.sup.X1)—, and R.sup.X1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group. At least two of Ar.sup.1 represent prescribed groups.

A compound with which the luminance life of a light emitting device is excellent is represented by formula (1):

##STR00001##

n represents an integer of 2 or more and 20 or less, R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group or a halogen atom. Ar.sup.1 represents a mono-cyclic or condensed-cyclic arylene group, a mono-cyclic or condensed-cyclic divalent heterocyclic group or a group represented by —N(R.sup.X1)—, and R.sup.X1 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a monovalent heterocyclic group. At least two of Ar.sup.1 represent prescribed groups.