NOVELTY - Use of a polycyclic metal complex or transition metal complex having a low energy difference of 50-2000, preferably 50-500 cm -1between the lowest triplet state, and the overlying and thermal re-occupation of the triplet-occupied-singlet state, in an organic electronic device, is claimed.    USE - The polycyclic metal complex or transition metal complex is useful in an organic electronic device, preferably organic light-emitting diode, light-emitting electrochemical cell, organic light-emitting diode-sensors, preferably in not hermetical externally shielded gas and steam sensors, organic solar cells (organic photovoltaics), organic field effect transistors or organic lasers. The complex is useful for the production of light with certain wave length, preferably blue light in the organic light emitting diode (all claimed).    ADVANTAGE - The complex provides short emission lifetime to the organic light emitting diode, which in turn exhibits high efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) the organic electronic device, preferably organic light-emitting diode, light-emitting electrochemical cell, organic light-emitting diode-sensors, preferably in not hermetical externally shielded gas and steam sensors, organic solar cells (organic photovoltaics), organic field effect transistors or organic lasers comprising the metal complex of formula (I)-(XIV); and    (2) a process for the production of blue light, preferably in organic light emitting diode comprising using the metal complex (I)-(V), where: the central metal (M and M1) is platinum and/or palladium, and M is same or different from M1.    M, M1, M2=Rh(I), Ir(I), Pd(II), Pt(II) or Au(III);    L 1-L 9=F, Cl, Br, I, CN, NCO, SCN, CH 3), phenyl, CH 2=CH, Ph-C?=C, RO, RS, OH, N(R) 3, RN=C(R1a), pyridine, P(R) 3, As(R) 3, RCN, RNC, ROR1a, RSR1a, or RSeR1a;    R, R1a=H, halo, or a substituent, which is bonded over OR2a, N(R2a) 2or Si(R2a) 3, or alkyl, aryl, heteroaryl or alkenyl (all optionally substituted by halo, lower alkyl groups and further donor and acceptor groups;    R2a=R;    D=(R) 2N, (R) 2P, (R) 2As, CN, NC, RO, RS, RSe, RN, O, S, Se, NR, CH 2, CH= or C?=C; and    n=-4, -3, -2, -1, 0 or 1-6, preferably 0.