The present disclosure provides a new series of compounds exhibiting high fluorescence quantum yields in the solid state. In one embodiment, the compounds include a series of 2,3,4,5-tetraphenylgermoles with the same or different 1,1-substituents. In another embodiment, substituted germafluorenes, germa-fluoresceins/rhodamines, and germapins are described. These germanium heterocycles possess ideal photophysical and thermostability properties, which makes them excellent candidates for chemical or biological sensors, host materials for electroluminescent devices and solar cells, and emissive and/or electron-transport layer components in organic light emitting diode devices.

Described herein are molecules for use in organic light emitting diodes. Example molecules comprise at least one moiety A and at least one moiety D. Values and preferred values of the moieties A and D are described herein. The molecules comprise at least one atom selected from Si, Se, Ge, Sn, P, or As.

A dual host system for OLEDs that contains hole-transporting indolocarbazole and electron-transporting indolocarbazole exhibiting superior performance in the OLEDs is disclosed.

The present invention relates to a compound of a formula (I) or (II), to the use of this compound in an electronic device, and to an electronic device comprising one or more compounds of the formula (I) or (II). The invention furthermore relates to the preparation of the compound of the formula (I) or (II) and to a formulation comprising one or more compounds of the formula (I) or (II).

The present invention relates to a novel indole-based compound having excellent hole injection and transport capabilities, light-emission, and other properties, and to an organic electroluminescent device the luminous efficiency, driving voltage, service life, and other characteristics of which are improved due to containing the compound in one or more organic material layers.

An organic electroluminescence device includes: an anode; a cathode; an emitting layer provided between the anode and the cathode, in which the emitting layer contains a delayed fluorescent compound M2 and a compound M3 represented by a formula (3), and a singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy the relationship S.sub.1(M3)>S.sub.1(M2). In the formula (3), A.sub.30 is a group represented by a formula (3a) or the like.

##STR00001##

Disubstituted diaryloxybenzoheterodiazole compound of general formula (I):

##STR00001##

in which: Z represents a sulfur atom, an oxygen atom, a selenium atom; or an NR.sub.5 group in which R.sub.5 is selected from linear or branched C.sub.1-C.sub.20, or from optionally substituted aryl groups; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined in the claims. The disubstituted diaryloxybenzoheterodiazole compound of general formula (I) can advantageously be used as a spectrum converter in luminescent solar concentrators (LSCs) which are in turn capable of improving the performance of photovoltaic devices (or solar devices) selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules) on either a rigid substrate or a flexible substrate.

Disubstituted diaryloxybenzoheterodiazole compound having general formula (I) or (II) and luminescent solar concentrator (LSC) including the same: ##STR00001##
wherein: Z represents a sulfur atom, an oxygen atom, a selenium atom; or an NR.sub.6 group wherein R.sub.6 is selected from linear or branched C.sub.1-C.sub.20 alkyl groups, or from optionally substituted aryl groups; R.sub.1, R.sub.2 and R.sub.3, identical or different, represent a hydrogen atom; or are selected from linear or branched C.sub.1-C.sub.20 alkyl groups optionally containing heteroatoms, optionally substituted cycloalkyl groups, optionally substituted aryl groups, optionally substituted linear or branched C.sub.1-C.sub.20 alkoxy groups, optionally substituted phenoxy groups, or a cyano group; or R.sub.1 and R.sub.2, may optionally be bound together to form, together with the carbon atoms to which they are bound, a saturated, unsaturated or aromatic, cyclic or polycyclic system containing from 3 to 14 carbon atoms, optionally containing one or more heteroatoms; or R.sub.2 and R.sub.3, may optionally be bound together so as to form, together with the carbon atoms to which they are bound, a saturated, unsaturated or aromatic, cyclic or polycyclic system containing from 3 to 14 carbon atoms, optionally containing one or more heteroatoms; R.sub.4, identical or different, represent a hydrogen atom; or are selected from linear or branched C.sub.1-C.sub.20 alkyl groups; R.sub.5, identical or different, are selected from linear or branched C.sub.1-C.sub.20 alkyl groups, optionally containing heteroatoms, or optionally substituted cycloalkyl groups; n and m, identical or different, are 0 or 1, provided that at least one of n and m is 1.

The present invention includes novel heterocyclic materials for use as blue phosphorescent materials in OLED devices. The novel materials include two fused 5-membered aromatic or pseudoaromatic rings, which are bonded with 6 membered aromatic rings to serve as chelation ligands for a transition metal. The novel materials were determined computationally to have appropriate triplet energies for use as blue emitters and to possess sufficient chemical stability for use in devices.

Novel phosphorescent metal complexes containing ligands having the Formula I: ##STR00001##
bearing either a naphthalene or other fused heterocycle moieties such as benzofuran and benzothiophene useful as emitters in OLEDs and improve the device efficiency and the FWHM of the emission.