TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The light emitting particle comprises a semiconductor nanocrystal from a group II-VI compound, group III-V compound, group IV-VI compound, group IV element and/or a group IV compound.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The first monomer that comprises at least two thiol (-SH) groups is a substituted thiol compound of formula ((R1)k1-L1-(Y1-(SH)m)k2) (I). The second monomer is substituted compound of formula ((R2)k3-L2-(Y2-(X)n)k4) (II). The thiol group of the first monomer and the unsaturated carbon-carbon bond of the second monomer are present at a mole ratio of 1:0.75-1:1.25. The polymer is a polymerized product which is obtained by further polymerizing a third monomer that comprises one thiol group located at the terminal end of the third monomer and/or fourth monomer that comprises one unsaturated carbon-carbon bond located at a terminal end of the fourth monomer. The optoelectronic device further comprises: an additional polymer film that contains an organic/inorganic hybrid polymer between the emission layer and the polymer film; and a transparent plate between the light source and the emission layer. The organic/inorganic hybrid polymer comprises a first moiety that contains a siloxane bond of formula (-Si-O-Si-), a second moiety that contains a siloxane bond and at least one functional group, and a third moiety that contains a siloxane bond and a crosslinked structure of at least one reactive functional group. The organic/inorganic hybrid polymer further comprises a fourth moiety that contains metal oxide bond of formula (-O-M-O-). The organic/inorganic hybrid polymer is a condensation polymerization polymer of a first alkoxy silane of formula ((R12)(Si)(R11)(R13)(R14)), a second alkoxy silane of formula ((R21)p-Si-(R22)4-p), and a third alkoxy silane of formula ((R31)q-Si-(R32)4-q). The light emitting particle further comprises a coating that comprises a polymer containing carboxy group or its salt. The stacking structure further comprises an additional polymer film that comprises the organic/inorganic hybrid polymer between the composite layer and the polymer film.R1 = linear or branched 1-30C alkyl, 6-30C aryl, 3-30C heteroaryl, 3-30C cycloalkyl, 3-30C heterocycloalkyl, 2-30C alkenyl, 2-30C alkynyl, 1-60C amine of formula (-NRR1), 3-30C alicyclic organic group comprising double bond or triple bond in a ring or 3-30C heterocycloalkyl group comprising double bond or triple bond in a ring (all optionally substituted), 3-30C alicyclic or 3-30C heterocycloalkyl (both substituted with 2-30C alkenyl or 2-30C alkynyl), OH, -NH2, isocyanurate, (meth)acrylate, halo, -R98OR99, -C(=O)OR99, -CN, -C(=O)ONR99R99 or H;R, R1 = linear or branched 1-30C alkyl;R98 = 1-20C alkylene;R99 = H or linear or branched 1-20C alkyl;L1 = 1-30C alkylene, 6-30C arylene, 6-30C heteroarylene, 3-30C cycloalkylene or 3-30C heterocycloalkylene (all optionally substituted) or single bond;Y1 = 1-30C alkylene or 2-30C alkenylene (both optionally substituted and at least one of the methylene group is replaced by sulfonyl (-S(=O)2-), carbonyl (-C(=O)-), ether (-O-), sulfide (-S-), sulfoxide (-S(=O)-), ester (-C(=O)O-), amide of formula (-C(=O)NR1g-) and/or -NR1g- or single bond;R1g = H or linear or branched 1-10C alkyl;k1 = 0 or 1 or more;m, k2 = 1 or more;m+k2 = 3 or more;X = 2-30C aliphatic organic group comprising a carbon-carbon unsaturated bond, 6-30C aromatic group comprising a carbon-carbon double bond or carbon-carbon triple bond or 3-30C alicyclic organic group comprising a carbon-carbon double bond or a carbon-carbon triple bond;R2 = linear or branched 1-30C alkyl, 6-30C aryl, 3-30C heteroaryl, 3-30C cycloalkyl, 3-30C heterocycloalkyl, 2-30C alkenyl, 2-30C alkynyl or 1-60C amine of formula (-NRR1) (all optionally substituted), optionally substituted 3-30C alicyclic organic group (which is norbornene, maleimide, nadimide and/or tetrahydrophthalimide) comprising double bond or triple bond in a ring, 3-30C alicyclic or 3-30C heterocycloalkyl (both substituted with 2-30C alkenyl or 2-30C alkynyl), OH, -NH2, isocyanate, isocyanurate, (meth)acryloyloxy, halo, -R98OR99, acyl halide of formula (-R1xC(=O)X1), -C(=O)OR99, -CN or -C(=O)ONR99R99 or H;R1x = alkylene (optionally substituted)X1 = halo;L2 = 1-30C alkylene, 6-30C arylene, 3-30C heteroarylene, 3-30C cycloalkylene or 3-30C heterocycloalkylene (all optionally substituted) or single bond (preferably pyrrolidinyl, tetrahydrofuranyl, pyridyl, pyrimidyl, piperidyl, triazinyl, trioxotriazinyl or isocyanurate (all optionally substituted));Y2 = Y1;k3 = 0 or 1 or more;n, k4 = 1 or more;n+k4 = 3 or more;M = Al, Sn, Ti, Zr, Ge and/or B;R11-R14 = linear or branched 1-8C alkoxy, 6-12C aryloxy, 2-10C carbonylalkyl or 2-10C carbonylalkoxy (all optionally substituted), OH or halo;R21 = 6-20C aryl, 1-20C linear or branched alkyl, 1-20C aminoalkyl, 2-20C alkynyl, 2-20C alkenyl,1-20C amine (all optionally substituted) , -C(=O)OR1r or -C(=O)ONRR1r;R1r = 1-20C linear or branched alkyl;R22 = 1-8C linear or branched alkoxy, 6-12C aryloxy, 2-10C carbonylalkyl or 2-10C carbonylalkoxy (all optionally substituted), OH or halo;p = 1-3;R31 = reactive photo-crosslinking or thermal crosslinking functional group comprising (meth)acryloxy, epoxy, 2-30C alkenyl (optionally substituted), 2-30C alkynyl (optionally substituted), spiroorthoester, 3-30C alicyclic organic group comprising a double bond or triple bond in a ring (optionally substituted), 3-30C heterocycloalkyl comprising a double bond or triple bond in a ring (optionally substituted), 3-30C alicyclic organic group or 3-30C heterocycloalkyl (both substituted with 2-30C alkenyl or 2-30C alkynyl);R32 = 1-8C linear or branched alkoxy, 6-12C aryloxy, 2-10C carbonylalkyl or 2-10C carbonylalkoxy (all optionally substituted), OH or halo; andq = 1-3.Provided that m does not exceed the valence of Y1; sum of k1 and k2 does not exceed the valence of L1; n does not exceed the valence of Y2; and sum of k3 and k4 does not exceed the valence of L2.