The present invention relates to organic light-emitting devices comprising (a) an anode, (i) a cathode, and (e) an emitting layer between the anode and cathode, comprising 2 to 40% by weight of a triplet emitter X having a difference of the singlet energy (E.sub.S1(X)) and the triplet energy (E.sub.T1(X)) of less than or equal to 0.4 eV [Δ(E.sub.S1(X))−(E.sub.T1(X))≤0.4 eV], 0.05 to 5.0% by weight of a fluorescent emitter Y and 55 to 97.95% by weight of a host compound(s), wherein the amount of the triplet emitter X, the fluorescent emitter Y and the host compound(s) adds up to a total of 100% by weight and the singlet energy of the triplet emitter X (E.sub.S1(X)) is greater than the singlet energy of the fluorescent emitter Y (E.sub.S1(Y)) [(E.sub.S1(X))>E.sub.S1(Y)]. By doping, for example, an emitting layer containing a luminescent organometallic complex having a small S.sub.1-T.sub.1 splitting, with a fluorescent emitter the emission decay time can significantly be shortened without sacrificing external quantum efficiency (EQE) because of very efficient energy transfer.

Disclosed are a quantum dot material, a method for patterning a quantum dot film and a quantum dot light emitting device. when preparing a patterned quantum dot film, firstly, a quantum dot film is made by using the quantum dot material with the photolysis group, and a corresponding region of the quantum dot film is irradiated with ultraviolet light under the shielding of a mask template, so that the photolysis group in the corresponding region is photolyzed into the polarity change group, thereby changing the solubility of the quantum dot material in the corresponding region; and subsequently, the quantum dot film is cleaned by using a solvent which can dissolve the quantum dot material with the photolysis group, the quantum dot material in non-irradiated regions is dissolved and removed, and the quantum dot material in the corresponding region is retained to form a pattern of the quantum dot film.

The present invention discloses a patterned perovskite film, a preparation method thereof, and a display device. The method includes mixing a perovskite precursor and a photo-initiated polymer monomer, and realizing polymerization of a part of a predetermined area under shielding of a photomask, that is, the formed perovskite crystals are encapsulated by the formed polymer with formation of the patterned perovskite film.

An organic light-emitting device includes an organometallic compound represented by M.sub.1(L.sub.1).sub.n1(L.sub.2).sub.n2, wherein L.sub.1 is a ligand represented by Formula 1-1: ##STR00001##
In Formula 1-1, *1 to *4 indicate a binding site to M.sub.1, and Z.sub.11 and Z.sub.12 are respectively boron (B) and nitrogen (N), or N and B. When M.sub.1 binds to an α-position of the B or N atom, metal-ligand charge transfer in the complex may be improved. An OLED including the organometallic compound may have a long lifespan and improved luminescent efficiency and colorimetric purity.

The present invention relates to an electronic device comprising between a first electrode and a second electrode at least one first hole transport layer, wherein the first hole transport layer comprises (i) at least one first hole transport matrix compound consisting of covalently bound atoms and (ii) at least one electrical p-dopant selected from metal salts and from electrically neutral metal complexes comprising a metal cation and a at least one anion and/or at least one anionic ligand consisting of at least 4 covalently bound atoms, wherein the metal cation of the electrical p-dopant is selected from alkali metals; alkaline earth metals, Pb, Mn, Fe, Co, Ni, Zn, Cd; rare earth metals in oxidation state (II) or (III); Al, Ga, In; and from Sn, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W in oxidation state (IV) or less; provided that a) p-dopants comprising anion or anionic ligand having generic formula (Ia) or (Ib). ##STR00001##

To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the host material is higher than a LUMO level of the host material, and a HOMO level of the guest material is lower than a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. The difference between a singlet excitation energy level and a triplet excitation energy level of the host material is greater than 0 eV and less than or equal to 0.2 eV. The energy difference between the LUMO level and the HOMO level of the host material is larger than or equal to light emission energy of the guest material.

The present invention relates to organic light-emitting devices comprising (a) an anode, (i) a cathode, and (e) an emitting layer between the anode and cathode, comprising 2 to 40% by weight of a triplet emitter X having a difference of the singlet energy (E.sub.S1(X)) and the triplet energy (E.sub.T1(X)) of less than or equal to 0.4 eV [Δ(E.sub.S1(X))−(E.sub.T1(X))≤0.4 eV], 0.05 to 5.0% by weight of a fluorescent emitter Y and 55 to 97.95% by weight of a host compound(s), wherein the amount of the triplet emitter X, the fluorescent emitter Y and the host compound(s) adds up to a total of 100% by weight and the singlet energy of the triplet emitter X (E.sub.S1(X)) is greater than the singlet energy of the fluorescent emitter Y (E.sub.S1(Y)) [(E.sub.S1(X))>E.sub.S1(Y)]. By doping, for example, an emitting layer containing a luminescent organometallic complex having a small S.sub.1-T.sub.1 splitting, with a fluorescent emitter the emission decay time can significantly be shortened without sacrificing external quantum efficiency (EQE) because of very efficient energy transfer.

Provided are boron-containing compounds having a structure of Formula I ##STR00001##
wherein ring A, Z, X.sup.1-X.sup.3, R.sup.A, R.sup.B, R.sup.1, and R.sup.2 are defined herein.

Novel phosphorescent metal complexes containing ligands having the Formula I: ##STR00001##
bearing either a naphthalene or other fused heterocycle moieties such as benzofuran and benzothiophene useful as emitters in OLEDs and improve the device efficiency and the FWHM of the emission are disclosed.

Disclosed herein are precursor compounds, composite electrodes comprising the same, and methods of making and use thereof.