The invention relates to small photosensitizers, their process of preparation and uses of the compounds in optical imaging and photodynamic therapy. The invention provides a compound of formula (I), a derivative or a salt thereof Wherein R1 is selected from the group consisting of amines, anilines, phenols, thiophenols, selenols and aryl groups; R2 and R3 independently are H or halogen; R4 is selected from the group consisting of H, nitre and cyano: and R5 and R6 independently are either absent or oxygen or methyl.

##STR00001##

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed:

##STR00001##

In Chemical Formula 1, each substituent is the same as defined in the detailed description.

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed:

##STR00001##

In Chemical Formula 1, each substituent is the same as defined in the detailed description.

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed: ##STR00001## In Chemical Formula 1, each substituent is the same as defined in the detailed description.

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed: ##STR00001## In Chemical Formula 1, each substituent is the same as defined in the detailed description.

The invention relates to small photosensitizers, their process of preparation and uses of the compounds in optical imaging and photodynamic therapy. The invention provides a compound of formula (I), a derivative or a salt thereof Wherein R1 is selected from the group consisting of amines, anilines, phenols, thiophenols, selenols and aryl groups; R2 and R3 independently are H or halogen; R4 is selected from the group consisting of H, nitro and cyano: and R5 and R6 independently are either absent or oxygen or methyl. ##STR00001##

The invention relates to small photosensitizers, their process of preparation and uses of the compounds in optical imaging and photodynamic therapy. The invention provides a compound of formula (I), a derivative or a salt thereof Wherein R1 is selected from the group consisting of amines, anilines, phenols, thiophenols, selenols and aryl groups; R2 and R3 independently are H or halogen; R4 is selected from the group consisting of H, nitro and cyano: and R5 and R6 independently are either absent or oxygen or methyl. ##STR00001##

The present disclosure relates to an organic electroluminescent device and an organic electroluminescent compound. By comprising the compound according to the present disclosure or a specific combination of compounds according to the present disclosure, it is possible to produce an organic electroluminescent device having lower driving voltage, higher luminous efficiency and/or improved lifetime properties, compared to the conventional organic electroluminescent device.

The present disclosure relates to an organic electroluminescent device and an organic electroluminescent compound. By comprising the compound according to the present disclosure or a specific combination of compounds according to the present disclosure, it is possible to produce an organic electroluminescent device having lower driving voltage, higher luminous efficiency and/or improved lifetime properties, compared to the conventional organic electroluminescent device.

A compound of Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed:

##STR00001##

In Chemical Formula 1, each substituent is the same as defined in the detailed description.