The present invention relates to the use of a compound in single-molecule localization microscopy (SMLM), in stimulated emission depletion microscopy (STED), in minimal emission fluxes microscopy (MINFLUX) or in structured illumination and localization microscopy (SIMFLUX), wherein the compound is a substituted or unsubstituted polycyclic aromatic hydrocarbon comprising six or more substituted and/or unsubstituted aromatic hydrocarbon rings, wherein each of at least six of the six or more substituted and/or unsubstituted aromatic hydrocarbon rings is fused with at least another one of the at least six substituted and/or unsubstituted aromatic hydrocarbon rings.

An organic compound that emits red light having a long wavelength and that is represented by formula [1] below. In the formula [1], R.sub.1 to R.sub.24 are each independently selected from a hydrogen atom or a substituent. ##STR00001##

Disclosed herein are pyrene heterocyclic compounds useful for an organic light-emitting diode and an organic light-emitting diode including same. More specifically, compound represented by [Chemical Formula A] or [Chemical Formula B] and an organic light-emitting diode are provided. [Chemical Formula A] and [Chemical Formula B] are as defined in the Description.

A method is provided for using twisted acenes, and more particularly to configurationally stable twisted acenes that are imbedded into the structure of [7]helicene at the fulcrum ring to form useable material structures. The helicene propagates its chiral nature into the acene, while acting as a locking mechanism to thermal racemization. These doubly-helical compounds are part of a new homologous series of polycyclic aromatic hydrocarbons, namely the [7]helitwistacenes. Such [7]helitwistacenes have utility as materials suitable for forming a circularly polarized organic light emitting diode (CP-OLED) for direct emission of circularly polarized (CP) light for the fabrication of high efficiency electronic displays.

A method is provided for using twisted acenes, and more particularly to configurationally stable twisted acenes that are imbedded into the structure of [7]helicene at the fulcrum ring to form useable material structures. The helicene propagates its chiral nature into the acene, while acting as a locking mechanism to thermal racemization. These doubly-helical compounds are part of a new homologous series of polycyclic aromatic hydrocarbons, namely the [7]helitwistacenes. Such [7]helitwistacenes have utility as materials suitable for forming a circularly polarized organic light emitting diode (CP-OLED) for direct emission of circularly polarized (CP) light for the fabrication of high efficiency electronic displays.

A compound represented by a formula (1) and having at least one deuterium atom is provided. In the formula (1), n is 1 to 4, L.sub.1 is a divalent group or a group represented by a formula (11) and R.sub.111 to R.sub.119 and R.sub.211 to R.sub.219 are each independently a hydrogen atom or a substituent, where the compound represented by the formula (1) does not include a group represented by —N(R.sub.906) (R.sub.907) and R.sub.906 and R.sub.907 are each independently a hydrogen atom, an alkyl group having 1 to 50 carbon atoms, or the like. In the formula (11), X.sub.13 is an oxygen atom or a sulfur atom, Y.sub.1 to Y.sub.8 are each independently CR.sub.300 or a nitrogen atom, and two of R.sub.300 are a single bond bonded with *a or other L.sub.1 and a single bond bonded with *b or other L.sub.1.

##STR00001##

The present disclosure relates to display technologies, and particularly discloses an organic electroluminescent device. This organic electroluminescent device includes a light-emitting layer, the light-emitting includes an exciplex composed of a donor molecule and an acceptor molecule, and a wide band gap material for increasing the inter-molecular spacing between the donor molecule and the acceptor molecule. According to the device of the present disclosure, the degree of orbital overlap of HOMO and LUMO of the formed exciplex and the singlet-triplet energy level difference can be reduced, the reverse intersystem crossing rate (k.sub.RISC) of the exciplex host can be increased, the Föster energy transferred to the guest molecule can be enhanced, and the efficiency and the lifetime of the device can be improved.

A photon upconversion composition containing a naphthalene compound substituted with a substituent containing at least one selected from the group consisting of an alkynyl group, a substituted silyl group, a benzene ring, an heteroaromatic ring, a cyano group and a halogen atom can efficiently convert an excitation light into a UV light at a low excitation light intensity.

A photon upconversion composition containing a naphthalene compound substituted with a substituent containing at least one selected from the group consisting of an alkynyl group, a substituted silyl group, a benzene ring, an heteroaromatic ring, a cyano group and a halogen atom can efficiently convert an excitation light into a UV light at a low excitation light intensity.

An organic compound is represented by formula (1). In the formula (1), R.sub.1 to R.sub.24 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted aryloxy group, a silyl group, and a cyano group. ##STR00001##