NOVELTY - A photoactive composition (C1) comprises: a first host material having a highest occupied molecular orbital (HOMO) energy level shallower than or equal to -5.6 eV and having a glass transition temperature (Tg) greater than 95 degrees C; a second host material having a lowest unoccupied molecular orbital (LUMO) deeper than -2.0 eV; and an electroluminescent dopant material; where the weight ratio of first host material to second host material is 99:1 to 1.5:1.    USE - For making organic light-emitting device (claimed) such as devices that convert electrical energy into radiation (e.g. light-emitting diode, light emitting diode display, and diode laser); devices that detect signals through electronics processes (e.g. photodetectors, photoconductive cells, photoresistors, photoswitches, phototransistors, phototubes, IR detectors, and biosensors); devices that convert radiation into electrical energy, (e.g. photovoltaic device or solar cell); devices that include electronic components that include at least one organic semi-conductor layers (e.g. transistor or diode); and in printed electronics application including photovoltaics and TFTs (thin-film transistors).    ADVANTAGE - The composition provides organic light-emitting device having high efficiency and long lifetimes.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an organic light-emitting device comprising: an anode; a hole transport layer; a photoactive layer; an electron transport layer; and a cathode; where the light emitting layer comprises: the first host material; the second host material; and the electroluminescent dopant material; and    (2) making an organic light-emitting device involving: providing a substrate having a patterned anode on it; forming a hole transport layer by depositing a liquid composition comprising a hole transport material in a first liquid medium; forming a photoactive layer by depositing a liquid composition comprising the photoactive composition (C1); and a second liquid medium; forming an electron transport layer by vapor deposition of an electron transport material; and forming a cathode overall.