The present invention relates to a process to produce compounds of the formula (1) which are suitable for use in electronic devices, as well as to intermediate compounds of formula (Int-1) and compounds of formula (1-1) and (1-2) obtained via the process. These compounds are particularly suitable for use organic electroluminescent devices. The present invention also relate to electronic devices, which comprise these compounds.

An organometallic compound represented by Formula 1A: ##STR00001## wherein, in Formula 1A, groups and variables are the same as described in the specification.

The present invention relates to iridium complexes suitable for use in organic electroluminescent devices, especially as emitters.

A novel composite oxide semiconductor which can be used in a transistor including an oxide semiconductor film is provided. In the composite oxide semiconductor, a first region and a second region are mixed. The first region includes a plurality of first clusters containing In and oxygen as main components. The second region includes a plurality of second clusters containing Zn and oxygen as main components. The plurality of first clusters have portions connected to each other. The plurality of second clusters have portions connected to each other.

A number of new solutions for enhancing the extraction of waveguided mode and suppressing surface plasmon polariton mode in OLEDs are disclosed.

By providing a novel polycyclic aromatic amino compound having an amino substituent and having a plurality of aromatic rings linked via a boron atom, an oxygen atom, or the like, for example, as in the following formula, a selection range of a material for an organic EL element is widened. In addition, by using the novel polycyclic aromatic amino compound as a material for an organic electroluminescent element, an excellent organic EL element is provided ##STR00001##

Provided are boron-containing polycyclic compounds of Chemical Formula 1: ##STR00001## wherein X1 to X4 are identical to or different from one another and are each independently O, S, NR2 or CR3R4, and a to d are each 0 or 1, with the proviso that 1≤a+b+c+d, and the other substituents are as described in the specification. The compounds have a high electron accepting ability and excellent heat resistance, and can be highly purified by sublimation purification due to their high sublimation temperature. The compounds can form a stable interface with an electrode or an adjacent organic material layer of an organic light emitting device. Also provided is an organic light emitting device including the compound of Chemical Formula 1. The compound can lower driving voltage and lengthen lifetime of the organic light emitting device.

The present invention addresses the problem of providing: a luminescent thin film, a luminescent multilayered film, and an organic electroluminescent element that have luminescence properties with excellent storage stability in atmospheric air; and a production method therefor. This luminescent thin film contains a luminescent compound A, and is characterized by containing 0.0001 mass % or more of an oxide B of luminescent compound A in terms of the luminescent compound A.

The present invention provides an electrochromic polyamic acid material, a preparation method thereof and a display device, wherein the molecular structure of the electrochromic polyamic acid material includes oligoaniline and carbazolyl triphenylamine. The oligoaniline serves as an electrochemically sensitive group, and the carbazolyl triphenylamine serves as a fluorescence emitting group. The electrochromic polyamic acid material is an electrically controlled fluorescent polymer. Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages, resulting in an interchange between a benzene ring and an anthracene ring in a molecular structure, and an electron/energy transfer path with the fluorescence emitting group are generated or eliminated, thereby realizing the electrically controlled fluorescent properties of the electrochromic polyamic acid material.

A display screen and an electronic equipment are provided. The display screen comprises a middle frame, a display panel and an optical fingerprint sensor. The display panel is superimposed on the upper surface of the middle frame, and the through-hole provided on the middle frame and extending through the upper and lower surfaces of the middle frame is filled with a transparent body, the optical fingerprint sensor is disposed beneath the transparent body.