TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Compounds: The polycyclic compound (1) is preferably chosen from 12 polycyclic compounds, such as compounds of formulae (1a,3,6), more preferably of formulae (22,26). The polycyclic compound (2) is preferably chosen from 15 polycyclic compounds, such as compounds of formulae (2a,7,10), more preferably of formulae (14,23,27).X 3-X 6=oxygen, sulfur, N-R 1or CR 2R 3.Preferred Layer: The light emitting layer contains polycyclic-type compound as host material, and further contains phosphorescence luminosity material chosen from ortho metalation complex of platinum, iridium and osmium. An electron injection layer containing a nitrogen-containing ring derivative, and electron carrying layer containing polycyclic-type compound are provided between light emitting layer and cathode. A hole transport layer containing polycyclic-type compound is provided between light emitting layer and anode. A reducing dopant is provided in interface region of cathode and organic thin film layer. Full Definitions:    X 1,X 2=oxygen, N-R 1, or CR 2R 3;    R 1-R 3=1-20C alkyl, optionally 3-20C substituted cycloalkyl, 7-24C aralkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group;    n=2, 3, or 4;    L 3=coupling group;    L 1=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C bivalent optionally substituted silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (a) by carbon-carbon bond;    L 2=single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl group or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (c) by carbon-carbon bond;    A 1=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or aromatic heterocyclic group connected with L 1by carbon-carbon bond;    A 2=H, 3-20C optionally substituted cycloalkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C aromatic heterocyclic group connected with L 2by carbon-carbon bond;    Y 1-Y 3=1-20C alkyl, 3-20C optionally substituted cycloalkyl, 1-20C alkoxy, 7-24C aralkyl, 3-20C optionally substituted silyl, 6-24C optionally substituted aromatic hydrocarbyl or 3-24C optionally substituted aromatic heterocyclic group connected with benzene rings (a-c) by carbon-carbon bond;    d,f=0,1,2, or 3;and    e=0,1, or 2.    When, both X 1and X 2are N-R 1, at least one of R 1is monovalent condensed-ring-aromatic-compound 8-24C substituted heterocyclic group. When A 1,A 2are hydrogen, L 1is 1-20C alkylene. When n is 2, L 3is single bond, 1-20C alkylene, 3-20C optionally substituted cycloalkylene, 2-20C optionally substituted bivalent silyl, 6-24C optionally substituted bivalent aromatic hydrocarbyl or 3-24C optionally substituted bivalent aromatic heterocyclic group connected with benzene ring (c) by carbon-carbon bond, when n is 3, L 3is 1-20C trivalent saturated hydrocarbyl, 3-20C optionally substituted trivalent cycloalkane, trivalent silyl, 1-20C trivalent substituted silyl, 6-24C optionally substituted trivalent aromatic hydrocarbyl or 3-24C trivalent optionally substituted aromatic heterocyclic group. When n is 4, L 3is 1-20C tetravalent saturated hydrocarbyl, 3-20C optionally substituted tetravalent cycloalkane, silicon atom, 6-24C optionally substituted tetravalent aromatic hydrocarbyl or 3-24C tetravalent optionally substituted aromatic heterocyclic group. L 1, L 3are not simultaneously connected with para position with respect to benzene ring (b). A 1, A 2, L 1, L 2and L 3do not contain carbonyl group. X 1and X 2are oxygen or CR 2R 3, L 1,L 2are single bond, both A 1and A 2are hydrogen, and benzene ring (b) has 1 or 2 Y 2. Y 2is methyl group or unsubstituted phenyl group. Preferred Definitions:    A 1and/or A 2=pyrimidyl, carbazolyl, dibenzo furanyl having substituent chosen from phenyl, biphenyl group, terphenyl group or quaterphenyl group, or aromatic hydrocarbyl which has a structure in which 2 or more benzene rings bonds by meta position, where A 1is 3-2C optionally substituted silyl, 3-24C aromatic heterocyclic group connected with L 1by carbon-carbon bond, preferably aromatic heterocyclic group chosen from pyridazine pyrimidine, pyrazine, 1,3,5-triazine, carbazole, dibenzofuran, dibenzothiophene, phenoxazine, phenothiazine and dihydroacridine connected with L 1by carbon-carbon double bond;and    X 1-X 2=N-R 1or oxygen, and at least one of R 1is dibenzofuran residue or carbazole residue.    SPECIFIC COMPOUNDS - 563 polycyclic-type compounds are disclosed e.g. 9-phenyl-3-(16-(9-phenyl-9H-carbazol-3-yl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaen-6-yl)-9H-carbazole of formula (A), 9-phenyl-3-(16-(3-(9-phenyl-9H-carbazol-3-yl)phenyl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaen-6-yl)-9H-carbazole, 3-(16-(3-(9H-carbazol-9-yl)phenyl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaen-6-yl)-9-phenyl-9H-carbazole, 6,16-diphenyl-2-(4-phenylphenyl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaene and 9-phenyl-3-(16-(9-phenyl-9H-carbazol-3-yl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1(13),2,4(9),5,7,11,14(19),15,17-nonaen-8-yl)-9H-carbazole.    EXAMPLE - 6,16-dibromo-10,20-dioxapentacyclo(11.7.0.03,11.04,9.014,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaene (in g) (2.5),(9-phenyl-9H-carbazol-2-yl)boranediol (3.8), aqueous solution of sodium carbonate (12 mL), dimethoxyethane (12 mL), toluene (12 mL) and tetrakis (triphenylphosphine)palladium (0.35) were added into three-necked flask, refluxed for 8 hours under argon atmosphere and cooled. The obtained sample was extracted, filtered, dried, concentrated and purified, to obtain 9-phenyl-3-(16-(9-phenyl-9H-carbazol-3-yl)-10,20-dioxapentacyclo(11.7.0.0 3,11.0 4,9.0 14,19)icosa-1,3(11),4(9),5,7,12,14(19),15,17-nonaen-6-yl)-9H-carbazole (A) in yield of 45%.