TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The nitrogen compound is preferably chosen from group of formula (1-2 to 1-4), and nitrogen-containing polycyclic compound is preferably chosen from group of formula (2-1 to 2-3). The compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is of formula: Z1-(Y1)m-Z2 (A-1) or Z1-(Y2)n-Z2 (A-2). The compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is a polymer. The polymer has repeating unit containing residue of compound of formula (A-1 or A-2). The compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound has heterocyclic structure containing residue of nitrogen compound and nitrogen-containing polycyclic compound, and partial structure adjacent to heterocyclic structure. The partial structure has 2 or more ( pi )-conjugation electron. The phosphorescent compound is an iridium complex or platinum complex. The phosphorescent compound has iridium or platinum as center metal, and is a metal complex having 8-quinolinol or its derivative(s), benzoquinolinol, its derivative(s), 2-phenyl-pyridine, or its derivative(s) as ligand.Z1,Z2=residue of nitrogen compound of formula (1-1 to 1-4) on one side and residue of nitrogen-containing polycyclic compound of formula (2-1 to 2-4) on other side;Y1=-C(Ra)(Rb)-, -N(Rc)-, -O-, -Si(Rd)(Re)-, -P(Rf)- or -S-;Ra-Rf=H or substituent;m=0-5;Y2=optionally substituted arylene;andn=1-5.Preferred Properties: The value of minimum triplet excitation energy computed with computing science method of compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is 3 eV or more. The absolute value of energy level of minimum non-occupancy molecular orbital computed with computing science method of compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is 1.5 eV or more. The absolute value of energy level of highest occupancy molecular orbital computed with computing science method of compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is 6.2 eV or more. The value of minimum triplet excitation energy (eV) of compound having residue of nitrogen compound and residue of nitrogen-containing polycyclic compound is greater than value of minimum triplet excitation energy of phosphorescent compound. Two plane angle between heterocyclic structure and partial structure is 40 degrees or more. Preferred Definitions:    R=alkyl, alkoxy, optionally substituted aryl or optionally substituted heteroaryl, preferably 3-10C alkyl or 3-10C alkoxy.