A heteroaromatic compound which can be used as the fluorescent guest material in the light emitting layer of the organic electroluminescence device is disclosed. The organic electroluminescence device employing the heteroaromatic compound of the present invention can operate under reduced driving voltage, increase current efficiency, and prolong half-life time.

A composition of materials including a first compound having a structure according to Formula I

##STR00001##

A composition of materials including a first compound having a structure according to Formula I

##STR00001##

An opto-electronic device includes a first electrode, a second electrode facing the first electrode, a photoactive layer arranged between the first electrode and the second electrode, and an organic compound represented by Formula 1:

##STR00001##

wherein a maximum absorption wavelength of the organic compound is in a range of about 490 nm to about 570 nm, and an oscillator strength (OSC) of the organic compound is in a range of about 0.8 to about 1.0.

An opto-electronic device includes a first electrode, a second electrode facing the first electrode, a photoactive layer arranged between the first electrode and the second electrode, and an organic compound represented by Formula 1:

##STR00001##

wherein a maximum absorption wavelength of the organic compound is in a range of about 490 nm to about 570 nm, and an oscillator strength (OSC) of the organic compound is in a range of about 0.8 to about 1.0.

A composition comprising a first compound and a second compound is described. The composition can be a mixture of a first compound having a structure according to Formula I, ##STR00001##
and a second compound having a structure according to Formula II, ##STR00002##
The composition can also be a mixture of a first compound having a structure according to Formula III, ##STR00003##
and a second compound having a structure according to Formula IV, ##STR00004##
Devices, such as OLEDs, that include the compositions for Formulas I & II or Formulas III & IV, as well as, methods of making the same are also described.

A composition comprising a first compound and a second compound is described. The composition can be a mixture of a first compound having a structure according to Formula I, ##STR00001##
and a second compound having a structure according to Formula II, ##STR00002##
The composition can also be a mixture of a first compound having a structure according to Formula III, ##STR00003##
and a second compound having a structure according to Formula IV, ##STR00004##
Devices, such as OLEDs, that include the compositions for Formulas I & II or Formulas III & IV, as well as, methods of making the same are also described.

A composition of materials including a first compound having a structure according to Formula I

##STR00001##

A composition of materials including a first compound having a structure according to Formula I

##STR00001##