Disclosed herein are organic light emitting diode (OLED) devices and methods of use thereof. In one embodiment, an organic light emitting diode (OLED) device includes an emitting layer including: a host and an emitter, wherein the host exhibits triplet-triplet annihilation up-conversion, wherein the emitter has a band gap and exhibits triplet-triplet annihilation up-conversion, wherein the host and the emitter are different, and wherein the emitter has a concentration of 5% or more in the emitting layer.

The invention relates to an optoelectronic device including a light-emitting layer, the light-emitting layer including (i) a host material, and (ii) an organic molecule including a structure of Formula I:

##STR00001## wherein R.sup.X is selected from the group consisting of: a halogen group; a cyano group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted alkynyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted aryloxy group; a substituted or unsubstituted aryl group; a substituted or unsubstituted heterocyclic group; and a substituted or unsubstituted hydrocarbon ring group.

An organic light-emitting diode and a display device using the same are provided. An organic light-emitting diode includes: a hole injection layer, a hole transport layer on the hole injection layer, a first emission layer configured to generate light of a short wavelength in a visible band, the first emission layer being on the hole transport layer, wherein one or more of the hole injection layer and the hole transport layer includes a phosphorescent dopant material at an interface between the hole injection layer and the hole transport layer.