TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The reactant comprises a chelated metal, where the chelated metal is a transition metal, rare earth metal, or main group metal. Preferred Parameter: The light is UV light. Preferred Device: The emissive layer further comprises a host.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The reactant is photoirradiated or heated in solid state, or in a polymer matrix. Making organoboron compounds involves reaction 1 or 2.G=independently carbon or a heteroatom (e.g., N, S, O, P);X and Y'=independently carbon or nitrogen;T=a terminal moiety;R=hydrogen, a linear, branched or cyclic aliphatic moiety, or an aryl (which includes heteroaryl) moiety, and may be further substituted;R'=hydrogen, a linear, branched or cyclic aliphatic moiety, or an aryl (which includes heteroaryl) moiety, and may be further substituted, and is optionally a fused ring(s);t=0 or 1;p=0-10; anddotted circle=optional aromaticity; with the proviso that at least one moiety bonded to B, excluding the terminal moiety, is a Lewis base.Photoirradiation is UV-irradiation. A reactant is doped into polymeric film, where the polymeric film's polymer comprises poly(methyl methacrylate) (PMMA) or poly(N-vinylcarbazole) (PVK). Photoirradiation or heat is used to create patterns in solid state or in a polymer matrix. The carbon atom of the elimination product is bonded to at least one less hydrogen than the carbon of the reactant. The elimination product's boron atom can undergo one or more subsequent elimination reaction(s) involving the same carbon atom or a different carbon atom. In harvesting photons, the separated charges recombine and photons are released. In separating charges, the separated charges migrate to respective electrodes to produce a potential difference. The reactant's boron is bound to three hydrogens and undergoes eliminations so that the final elimination product is a triboron compound. Preferred Components: The terminal moiety is a hydrogen atom, substituted or unsubstituted aliphatic, or substituted or unsubstituted aryl. It is methyl, unsubstituted phenyl, substituted phenyl, or mesityl. The second moiety is an aryl (which includes heteroaryl) moiety, N-heterocyclic carbene, or comprises a heteroatom. The aryl moiety is substituted or unsubstituted pyridyl. The N of the pyridyl ring is bonded to the boron. The ring comprising X is an N-heterocyclic carbene. The ring comprising X is pyridyl and the N of the pyridyl ring is bonded to B. The elimination product is photoluminescent or electroluminescent; the elimination product is an electron transport material; the elimination product is a hydrogen storage material; or the elimination product is a solar cell material. The reactant is: BN-1, BN-2, BN-3, BN-4, BN-7, (BN2)-1, (BN2)-2, BC-1, BC-2, BC-3, BC-4, BN-bpy1, SM1, DT1, or BN-Bpy-Pt1. Elimination product is a diboron molecule; or elimination product is BN-5 or BN-6. It is: BN-1a, BN-2a, BN-3a, BN-4a, (BN2)-1a, SM1-aza, DT1-aza, or BN-5b. A final product is a triboron compound or a conjugated polycyclic compound comprising B-N moieties. The product is a conjugated aromatic triboron compound or a 2D conjugated polyaromatic system comprising boron. The triboron compound is BN-5b, (BN)2-2a, BN-5c, BN-6c, BC-1b, BN-7b, BN-bpy1a, BN-bpy-Pt1a, or BC-1. The elimination product has bound to the boron: a carbene ring; a mesityl; a pyridyl ring; a pyridyl that is part of a fused ring system; an unsaturated five-membered heterocycle comprising both S and N ring atoms; or an unsaturated five-membered heterocycle comprising both S and N ring atoms that is part of a fused ring system. The elimination product is used in an optoelectronic device. It is a polycyclic pi-conjugated compound. The Lewis base comprises a pyridyl, a pyrimidinyl, a benzothiazolyl, or an imidazolyl. Elimination product is BN-bpy-Pt1, or BN-bpy-Pt1a. The elimination product is a polycyclic compound; the elimination product is an aromatic polycyclic compound; or the elimination product is a graphene where at least one C-C moiety has been replaced by a B-N moiety. The reactant comprises a reactant structure from reaction 1 or 2. The organoboron compound is BN-1a, BN-2a, BN-3a, BN-4a, (BN2)-1a, or BN-5b, SM1-aza, or DT1-aza. The organoboron compound is (BN)2-2, BN-5b, (BN)2-2a, BN-5c, BN-6c, BC-1b, BN-7b, BN-bpy1a, BN-bpy-Pt1a, BC-1, (BN)2-2b, BN-5, BN-6, BN-1a, BN-2a, BN-3a, BN-4a, (BN2)-1a, BN-5b, BN-5b, (BN)2-2a, BN-5c, BN-6c, BC-1b, BN-7b, BN-bpy1a, BN-bpy-Pt1a, BC-1, SM1-aza, or DT1-aza, given in the specification.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer is PMMA or PVK. The film is patterned with luminescent and non-luminescent areas. Preferred Definitions:    Y'=carbon;    X=nitrogen;    Y'=carbon;    G(of the ring comprising X)=a heteroatom;    R'=further substituted by a transition metal or a main group metal, where the transition metal is platinum or zinc, and the main group metal is aluminum or boron; or R' is a fused aromatic ring that bridges the ring comprising X and the ring comprising Y'; or R' is further substituted by a metal, where the photoirradiation is exposing to visible light;    t=zero and at least one ring atom is a heteroatom, so that ring is a five-membered heterocycle;    ring comprising Y'=substituted phenyl; and    R(substituent on B)=mesityl.    EXAMPLE - No suitable example given.