TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The nitrogen compound is preferably chosen from group of formula (1-2 to 1-3). The compound having residue of nitrogen compound is of formula: Z1-(Y1)m-Z2 (A-1) or Z1-(Y2)n-Z2 (A-2). The compound having residue of nitrogen compound of formula (A-1) is preferably of formula (A-1-1). The compound having residue of nitrogen compound is a high molecular compound. The high molecular compound has repeating unit containing residue of nitrogen compound of formula (A-1 or A-2). The high molecular compound having repeating unit of formula (A-1) is of formula (A-1-2). The compound having residue of nitrogen compound has heterocyclic structure containing nitrogen 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);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 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 is 1.5 eV or more. The value of minimum triplet excitation energy (eV) of compound having residue of nitrogen 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.