An ink composition for a light-emitting device includes a phosphine oxide-based charge transporting organic material, a first solvent represented by Formula 1, a second solvent represented by Formula 2, and a third solvent that is polar aprotic. A light-emitting device includes a layer prepared with the in composition. An electronic apparatus includes the light-emitting device:

HOR.sub.1(O).sub.mR.sub.2OH  [Formula 1]

R.sub.11OR.sub.12  [Formula 2]

A method of manufacturing an inorganic oxide particle having an inorganic oxide core and a hydroxyl group bonded to a surface thereof includes: preparing a first composition including an inorganic oxide core precursor and a proton supply compound; and heating the first composition. Additional embodiments provide a method of manufacturing an inorganic oxide layer including an inorganic oxide particle manufactured by the method, and a light-emitting device including an inorganic oxide layer manufactured by the method.

An organometallic compound is represented by Formula 1. A light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer disposed between the first electrode and the second electrode and including an emission layer, and at least one organometallic compound represented by Formula 1. An electronic apparatus includes the light-emitting device.

A display panel includes light-emitting electrodes respectively disposed in first to third emission areas, first intermediate layers respectively disposed in the first to third emission areas and respectively overlapping the light-emitting electrodes, a bank layer covering an edge of each of the first intermediate layers and including openings respectively overlapping the first intermediate layers, a counter electrode disposed on the bank layer and covering the light-emitting electrodes, quantum dot light-emitting layers arranged below the counter electrode and respectively disposed in the first to third emission areas, and a second intermediate layer between the first intermediate layer in the first emission area and the quantum dot light-emitting layer in the first emission area. The second intermediate layer is disposed in an opening of the bank layer corresponding to the first emission area, the opening being one of the openings of the bank layer.

An organic electroluminescence device comprising: a cathode; an anode; an emitting layer disposed between the cathode and the anode; and a first layer disposed between the emitting layer and the cathode, wherein the emitting layer comprises a host compound, the first layer comprises a first compound and a second compound, and the three compounds are in a relationship satisfying the following Conditions 1 and 2: (Condition 1) the electron affinity Af.sub.H of the host compound and the electron affinity Af.sub.ETA of the first compound satisfy the following expressions (1-1) and (1-2):

Af.sub.H<Af.sub.ETA  (1-1)

|Af.sub.H−Af.sub.ETA|≤0.10  (1-2) (Condition 2) the electron affinity Af.sub.H of the host compound and the electron affinity Af.sub.ETB of the second compound satisfy the following expressions (2-1) and (2-2):

Af.sub.H>Af.sub.ETB  (2-1)

|A.sub.fH−Af.sub.ETB|≤0.10  (2-2).

An organic electroluminescence device of one or more embodiments includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer and a second electrode on the electron transport region, wherein the hole transport region includes a monoamine compound represented by Formula 1, thereby showing high emission efficiency: ##STR00001##

An organic electroluminescence device comprising: a cathode, an anode, and at least one organic layer disposed between the cathode and the anode, wherein at least one layer of the at least one organic layer comprises a compound represented by the following formulas (1-1) and (1-3) or a compound represented by the following formulas (1-2) and (1-3). ##STR00001##

A light-emitting device includes a light-emitting layer, an electron transport layer provided on the light-emitting layer, and a cathode provided on the electron transport layer. A main component of the cathode is a metal boride. With the above configuration, a work function of the cathode is reduced and electron injection efficiency is improved. As a result, luminous efficiency of the light-emitting device is improved.

An organic electroluminescence device includes an anode, a cathode, an emitting layer between the anode and the cathode, a first electron transporting layer between the cathode and the emitting layer, and a second electron transporting layer between the cathode and the first electron transporting layer. The first electron transporting layer is directly adjacent to the emitting layer, the second electron transporting layer is directly adjacent to the first electron transporting layer, the emitting layer contains a first compound represented by Formula (1) below, the first compound has at least one group represented by Formula (11) below, the first electron transporting layer contains a second compound represented by Formula (2) below, and the second electron transporting layer contains a third compound represented by Formula (3) below.

##STR00001##

The present disclosure relates to compounds of Formula (I), (II), or (III) ##STR00001## as compounds capable of emitting delayed fluorescence, and uses of these compounds in organic light-emitting diodes.