An organic photodetector includes: a first electrode; a second electrode facing the first electrode; an activation layer between the first electrode and the second electrode; a hole injection layer between the first electrode and the activation layer; and a hole transport layer between the hole injection layer and the activation layer, wherein the hole transport layer includes: a first hole transport layer including a p-dopant; and a second hole transport layer not including a p-dopant.

An organic photodetector includes: a first electrode; a second electrode facing the first electrode; an activation layer between the first electrode and the second electrode; a hole injection layer between the first electrode and the activation layer; and a hole transport layer between the hole injection layer and the activation layer, wherein the hole transport layer includes: a first hole transport layer including a p-dopant; and a second hole transport layer not including a p-dopant.

A light emitting diode of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The hole transport region includes a first hole transport layer disposed adjacent to the first electrode and having a first refractive index, a second hole transport layer disposed adjacent to the emission layer and having a second refractive index, and a third hole transport layer disposed between the first hole transport layer and the second hole transport layer and having a third refractive index which is greater than each of the first refractive index and the second refractive index, thereby showing high light extraction efficiency and high emission efficiency properties.

A light emitting diode of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The hole transport region includes a first hole transport layer disposed adjacent to the first electrode and having a first refractive index, a second hole transport layer disposed adjacent to the emission layer and having a second refractive index, and a third hole transport layer disposed between the first hole transport layer and the second hole transport layer and having a third refractive index which is greater than each of the first refractive index and the second refractive index, thereby showing high light extraction efficiency and high emission efficiency properties.

There is disclosed a compound having Formula I ##STR00001## In Formula, I: Ar.sup.1 is selected from the group consisting of dibenzofuran, dibenzothiophene, or deuterated analogs thereof; Ar.sup.2 and Ar.sup.3 are the same or different and are hydrocarbon aryl, substituted derivatives thereof, or deuterated analogs thereof, with the proviso that Ar.sup.2 and Ar.sup.3 are not the same as Ar.sup.1; a is 0; and Ar.sup.1, Ar.sup.2, and Ar.sup.3 have no additional amino substituents.

There is disclosed a compound having Formula I ##STR00001## In Formula, I: Ar.sup.1 is selected from the group consisting of dibenzofuran, dibenzothiophene, or deuterated analogs thereof; Ar.sup.2 and Ar.sup.3 are the same or different and are hydrocarbon aryl, substituted derivatives thereof, or deuterated analogs thereof, with the proviso that Ar.sup.2 and Ar.sup.3 are not the same as Ar.sup.1; a is 0; and Ar.sup.1, Ar.sup.2, and Ar.sup.3 have no additional amino substituents.

Provided is the nitrogen-containing compound shown in Chemical formula 1, an organic electroluminescent device, and an electronic apparatus, relating to the technical field of organic materials. The nitrogen-containing compound can improve the performance of the organic electroluminescent device.

##STR00001##

The present specification relates to a polymer comprising a unit represented by Chemical Formula 1, a monomer represented by Chemical Formula 2, a coating composition comprising the same, an organic light emitting device formed using the same, and a method for manufacturing an organic light emitting device using the same:

##STR00001##

wherein the variables are described herein.

The present application provides a heterocyclic compound capable of significantly enhancing lifetime, efficiency, electrochemical stability and thermal stability of an organic light emitting device, and an organic light emitting device including the heterocyclic compound in an organic material layer.

The present application provides a heterocyclic compound capable of significantly enhancing lifetime, efficiency, electrochemical stability and thermal stability of an organic light emitting device, and an organic light emitting device including the heterocyclic compound in an organic material layer.