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 disclosure provides a nitrogen-containing heterocyclic compound having a general formula (I) and an organic photoelectric apparatus thereof. The general formula (I) is ##STR00001## wherein A.sub.1, A.sub.2, A.sub.3, A.sub.4, A.sub.5, A.sub.6, A.sub.7, A.sub.8, A.sub.9, and A.sub.10 are independently selected from a hydrogen atom, at least one compound having the general formula (II) and at least one compound having a general formula (III), ##STR00002## wherein Y.sub.1, Y.sub.2, and Y.sub.3 are independently selected from C and N; and R.sub.3 and R.sub.4 are independently selected from C.sub.6-30 aromatic group and C.sub.2-30 heterocyclic aromatic group, ##STR00003## wherein X is selected from oxyl group, sulfenyl group, substituted or non-substituted imino group, substituted or non-substituted methylene group, and substituted or non-substituted silicylene group, and R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11, and R.sub.12 are independently selected from hydrogen, deuterium, C.sub.1-30 alkyl group, C.sub.6-30 aromatic group, and C.sub.2-30 heterocyclic aromatic group.

An OLED is disclosed whose emissive layer has a first host and an emitter, where the emitter is a phosphorescent metal complex that is a Pt(II) or Pd(II) complex having a square planar coordinating geometry or has the formula of M(L.sup.1).sub.x(L.sup.2).sub.y(L.sup.3).sub.z, where E.sub.H1T, the T.sub.1 triplet energy of the first host, is higher than E.sub.ET, the T.sub.1 triplet energy of the emitter, where E.sub.ET is at least 2.50 eV, where the LUMO energy of the first host is higher than the HOMO energy of the emitter, where the absolute value of the difference between the HOMO energy of the emitter and the LUMO energy of the first host is E1, where aE1E.sub.ETb; and where a0.05 eV, and b0.60 eV.

An organometallic compound and an organic light-emitting device including the same.

An organic electroluminescence device includes an anode, a cathode, a first organic layer interposed between the anode and the cathode, a second organic layer interposed between the first organic layer and the cathode, and a bipolar layer interposed between the first organic layer and the second organic layer and having bipolar characteristics, in which at least one of the first organic layer and the second organic layer includes the first compound and the second compound, the first compound exhibits delayed fluorescence, and an energy gap T.sub.77K(M2) at 77[K] of the second compound is larger than an energy gap T.sub.77K(M1) at 77[K] of the first compound.

Disclosed is a benzazole derivative having a heteroaryl group, wherein the benzazole derivative having the heteroaryl group is represented by Chemical Formula 1. Also disclosed is an organic electroluminescence device including an organic layer containing the benzazole derivative having the heteroaryl group:

##STR00001##

wherein, each of Z1, X1, X2, X3, Ar1, Ar2, Ar3, m1, m2 and q is the same as defined in the specification.

An organic electroluminescent device having an anode, a cathode, and a light emitting layer between the anode and the cathode, in which the light emitting layer contains a first organic compound, a second organic compound, and a third organic compound that satisfy the following expression (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, is capable of enhancing the light emission efficiency. E.sub.S1(A), E.sub.S1(B) and E.sub.S1(C) represent a lowest, singlet excitation energy level of the first, second and third organic compound, respectively.
E.sub.S1(A)>E.sub.S1(B)>E.sub.S1(C)(A)

Arrangements for phosphorescent blue emissive materials, layers, and devices are provided. The arrangements include a host having first a triplet energy level of at least 2.8 eV and an absolute difference of not more than 0.3 eV between the first singlet and triplet energy levels, and an emitter that includes an emissive transition metal complex and a first triplet energy level of at least 2.7 eV.

A phosphorescent emitter or delayed fluorescent and phosphorescent emitters represented by Formula I or Formula II, where M is platinum or palladium. ##STR00001##

Provided herein are rigid macrocycles comprising a poly(peri-naphthalene) diimide (PPNDI) submit and a second diimide subunit having both high photoluminescent and electron accumulation activities. Also provided herein are methods of preparation of the rigid macrocycles and methods of using the same.