TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: In the device, the first host material is a chrysene derivative having at least on diarylamino substituent. In the device, the second host material is a phenanthroline derivative and the emissive dopant is an organometallic complex of iridium. In the device, the photoactive composition comprises a first host material, which is a chrysene derivative having at least one diarlyamino substituent; a second host material, which is a phenanthroline derivative; an emissive dopant, which is an organometallic Ir complex having red emission; and a non-emissive dopant, which is an organometallic Ir complex having a HOMO energy level shallower than the HOMO energy level of the both host materials.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The emissive dopant is an organometallic complex of iridium. The non-emissive dopant is of formula Ir(L)3 or Ir(L)2Y'.L=a monoanionic bidentate cyclometalating ligand coordinated through a carbon atom and a nitrogen atom;Y'=a monoanionic bidentate ligand.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition further comprises (wt.% based on the total weight of the photoactive composition): a second host material (1-49) having a HOMO energy level that is deeper than the HOMO energy level of the non- emissive dopant. Preferred Components: The weight ratio of the first host material to the second host material is 19:1 to 2:1. At least one material is deuterated. The first host material has a HOMO energy level deeper than -5.0 eV. The first host material has a Tg greater than 95 degrees C. The first host material is selected from phenanthrolines, quinoxalines, phenylpyridines, benzodifurans, and metal quinolinate complexes. The first host material is a compound of formula Ar2-N(Ar1)-Q'-(N(Ar3)-Ar4)m (I). The second host is a phenanthroline, a quinoxaline, a phenylpyridine, a benzodifuran, or a metal quinolinate complex.Ar1-Ar4=aryl;Q'=chrysene, phenanthrene, triphenylene, phenanthrolene, naphthalene, anthracene, quinoline, or isoquinoline;m=0-6. SPECIFIC COMPOUNDS - 14 Complexes are specified as the non-emissive dopant e.g. iridium complex of formula (Ia) having HOMO level of -5.17eV, iridium complex of formula (Ib) having HOMO level of -4.91eV, iridium complex of formula (Ic) having HOMO level of -4.84eV, iridium complex of formula (Id) having HOMO level of -5.18eV and iridium complex of formula (Ie) having HOMO level of -5.08eV.    EXAMPLE - A photoactive composition (test) comprising (wt.%): biphenyl-4-yl-chrysen-3-yl-(1,1';3',1'')terphenyl-4-yl-amine having Tg of 116 degrees C as first host material (65); 2,9-bis-(3-(3,6-diphenyl-carbazol-9-yl)-phenyl)-4,7-diphenyl-(1,10)phenanthroline as second host material (25); iridium complex of formula (II) as emissive dopant (8) and non-emissive dopant (Ie) (2) was prepared. A control photoactive composition was prepared in a similar manner as the test except that no non-emissive dopant was used. The photoactive composition was then used in organic device. The device prepared from test/control composition was evaluated for external quantum efficiency (EQE) at 1000 nits; x and y color coordinates according to the C.I.E. chromaticity scale; and time in hours to reach 50% of initial luminance (T50) calculated using acceleration factor of 1.7. The results for devices formed from test/control composition were: EQE = 7.8/2.8%; x and y color coordinates according to the C.I.E. chromaticity scale i.e. CIEx = 0.660/0.658; and CIEy = 0.338/0.339; and T50 = 40851/10716. The device efficiency and lifetime increased dramatically with the addition of the non-emissive dopant, while the color coordinates remained very nearly the same. The voltage increased somewhat.