TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Particles: The semiconductor fine particles are titanium oxide microparticles.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The cyclic compound (I) is chosen from 16 claimed compounds e.g. 5-carboxy-2-((3-((12-((3-((5-carboxy-1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylidene)-2-oxido-4-oxocyclobut-1-en-1-yl)methylidene)-3,11-diethyl-5,5,13,13-tetramethyl-3,11-diazatetracyclo(7.7.0.02,6.010,14)hexadeca-1,6,8,10(14),15-pentaen-4-ylidene)methyl)-2-oxido-4-oxocyclobut-2-en-1-ylidene)methyl)-1,3,3-trimethyl-3H-indol-1-ium iodide, 2-((3-((6,10-dimethyl-11-((2-oxido-4-oxo-3-((1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylidene)cyclobut-1-en-1-yl)methylidene)-4,12-dithia-6,10-diazatricyclo(7.3.0.03,7)dodeca-1(9),2,7-trien-5-ylidene)methyl)-2-oxido-4-oxocyclobut-2-en-1-ylidene)methyl)-1,3,3-trimethyl-3H-indol-1-ium iodide,2-((3-((6,10-dimethyl-11-((2-oxido-4-oxo-3-((1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylidene)cyclobut-1-en-1-yl)methylidene)-4,12-dithia-6,10-diazatricyclo(7.3.0.03,7)dodeca-1(9),2,7-trien-5-ylidene)methyl)-2-oxido-4-oxocyclobut-2-en-1-ylidene)methyl)-1,3,3-trimethyl-3H-indol-1-ium iodide, 2-((3-((6,12-dimethyl-11-((2-oxido-4-oxo-3-((1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylidene)cyclobut-1-en-1-yl)methylidene)-4,10-dithia-6,12-diazatricyclo(7.3.0.03,7)dodeca-1(9),2,7-trien-5-ylidene)methyl)-2-oxido-4-oxocyclobut-2-en-1-ylidene)methyl)-1,3,3-trimethyl-3H-indol-1-ium chloride and2-((3-((6,12-dimethyl-11-((2-oxido-4-oxo-3-((1,3,3-trimethyl-3H-indol-1-ium-2-yl)methylidene)cyclobut-1-en-1-yl)methylidene)-4,10-dithia-6,12-diazatricyclo(7.3.0.03,7)dodeca-1(9),2,7-trien-5-ylidene)methyl)-2-oxido-4-oxocyclobut-2-en-1-ylidene)methyl)-1,3,3-trimethyl-3H-indol-1-ium iodide. Preferred Definitions:    M=ruthenium;    d1,d2=1 or more;    LL1=ligand of formula (a)-(e);    at least one of R41,R42=aryl, alkenyl or alkyl;    at least one of R51 and R52, and R53 and R54=alkyl, alkenyl, alkynyl or aryl;    n=1 or more;    R13 or R14=thiophen ring, pyrrole ring or furan ring;    R61,R62,R71-R74=substituent;    f1,f2=0 or more;    LL2=8 claimed ligands e.g. ligand of formula (f)-(j);    R25-R32=acidic group;    R33-R40=substituent;    R41'-R45'=R1;    e1-e8,e13,e14,e16=0-4;    e9-e12,e15=0-6;    adjacent R25-R32 and R33-R40=ring;    m1,m2=1;    m3=1 or 2;    Q=benzene ring or naphthalene ring;    P1,P2=group of formula (k),(l);    V1=H, 5-carboxy, 5-sulfonic acid group, 5-methyl or 4,5-benzene ring;    n'=0-4;    n' of V1=ring;    Y'=S, NCH3 or C(CH3)2;and    Z=CH3, C2H5, C3H7 or CH2CH2COOH.