Light-emitting device

Patent metadata

Field	Value
Publication number	US-10978650-B2
Application number	US-201715472764-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Jun 2, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A light-emitting device is provided. The device includes a first electrode, a second electrode, an emission layer between the first electrode and the second electrode, a hole transport region between the first electrode and the emission layer, and an electron transport region between the emission layer and the second electrode. The hole transport region may include a hole transport layer, which in turn includes a first perovskite compound [A1l][B1m][X1]n with a neutral defect. A hole concentration of the first perovskite compound may be from about 1.0×1016 to about 9×1018 cm−3 at about 25° C.

First claim

What is claimed is:

1. A light-emitting device comprising:
a first electrode;
a second electrode opposite to the first electrode;
an emission layer between the first electrode and the second electrode;
a hole transport region between the first electrode and the emission layer; and
an electron transport region between the emission layer and the second electrode,
wherein the hole transport region comprises a hole transport layer,
the hole transport layer comprises a first perovskite compound with a neutral defect,
a hole concentration of the first perovskite compound is from about 1.0×10 16 to about 9×10 18 cm −3 at about 25° C., and
the first perovskite compound is represented by Formula 1:
[A 1 l ][B 1 m ][X 1 ] n   Formula 1

wherein, in Formula 1,
A 1 is at least one monovalent organic cation, at least one monovalent inorganic cation, or any combination thereof,
B 1 is La 2+ , ce 2+ , Pr 2+ , Nd 2+ , Pm 2+ , Eu 2+ , Gd 2+ , Tb 2+ , Ho 2+ , Er 2+ , Tm 2+ , Yb 2+ , Lu 2+ , or any combination thereof,
X 1 is at least one monovalent anion,
l, m, and n are each independently a real number greater than 0 and smaller than or equal to 10, and
l+2m=n,
and wherein the neutral defect of the first perovskite compound represented by Formula 1 is one selected from the following (a) to (l):
(a) where the unit has a vacancy in which A is absent (V A );
(b) where the unit has a vacancy in which B is absent (V B );
(c) where the unit has a vacancy in which X is absent (V X );
(d) where A is further added to the unit cell (Ai);
(e) where B is further added to the unit cell (Bi);
(f) where X is further added to the unit cell (Xi);
(g) where a B site in the unit cell is substituted by A (A B );
(h) where an A site in the unit cell is substituted by B (B A );
(i) where an X site in the unit cell is substituted by A (A X );
(j) where an X site in the unit cell is substituted by B (B X );
(k) where an A site in the unit cell is substituted by X (X A ); and
(l) where a B site in the unit cell is substituted by X (X B ),
wherein A represents A 1 in Formula 1, B represents B 1 in Formula 1, and X represents X 1 in Formula 1.

2. A light-emitting device comprising:
a first electrode;
a second electrode opposite to the first electrode;
an emission layer between the first electrode and the second electrode;
a hole transport region between the first electrode and the emission layer; and
an electron transport region between the emission layer and the second electrode,
wherein the electron transport region comprises an electron transport layer,
the electron transport layer comprises a second perovskite compound with a neutral defect,
an electron concentration of the second perovskite compound is from about 1.0×10 16 to about 9×10 18 cm −3 at about 25° C., and
the second perovskite compound is represented by Formula 2:
[A 2 o ][B 2 p ][x 2 ] q   Formula 2

wherein, in Formula 2,
A 2 is at least one monovalent organic cation, at least one monovalent inorganic cation, or any combination thereof,
B 2 is La 2+ , ce 2+ , Pr 2+ , Nd 2+ , Pm 2+ , Eu 2+ , Gd 2+ , Tb 2+ , Ho 2+ , Er 2+ , Tm 2+ , Yb 2+ , Lu 2+ , or any combination thereof,
X 2 is at least one monovalent anion,
o, p, and q are each independently a real number greater than 0 and smaller than or equal to 10, and
o+2p=q,
and wherein the neutral defect of the second peroyskite compound represented by Formula 2 is one selected from the following (a) to (l):
(a) where the unit has a vacancy in which A is absent (V A );
(b) where the unit has a vacancy in which B is absent (V B );
(c) where the unit has a vacancy in which X is absent (V X );
(d) where A is further added to the unit cell (Ai);
(e) where B is further added to the unit cell (Bi);
(f) where X is further added to the unit cell (Xi);
(g) where a B site in the unit cell is substituted by A (A B );
(h) where an A site in the unit cell is substituted by B (B A );
(i) where an X site in the unit cell is substituted by A (A X );
(j) where an X site in the unit cell is substituted by B (B X );
(k) where an A site in the unit cell is substituted by X (X A ); and
(l) where a B site in the unit cell is substituted by X (X B ),
wherein A represents A 2 in Formula 2, B represents B 2 in Formula 2, and X represents X 2 in Formula 2.

3. A light-emitting device comprising:
a first electrode;
a second electrode opposite to the first electrode;
an emission layer between the first electrode and the second electrode;
a hole transport region between the first electrode and the emission layer; and
an electron transport region between the emission layer and the second electrode,
wherein the hole transport region comprises a hole transport layer,
the electron transport region comprises an electron transport layer,
the hole transport layer comprises a first perovskite compound with a neutral defect,
the electron transport layer comprises a second perovskite compound with a neutral defect,
a hole concentration of the first perovskite compound is from about 1.0×10 16 to about 9×10 18 cm −3 at about 25° C.,
the first perovskite compound is represented by Formula 1,
an electron concentration of the second perovskite compound is from about 1.0×10 16 to about 9×10 18 cm −3 at about 25° C., and
the second perovskite compound is represented by Formula 2:
[A 1 l ][B 1 m ] n   Formula 1

[A 2 o ][B 2 p ][X 2 ] q   Formula 2

wherein, in Formulae 1 and 2,
A 1 and A 2 are each independently at least one monovalent organic cation, at least one monovalent inorganic cation, or any combination thereof,
B 1 and B 2 are each independently La 2+ , Ce 2+ , Pr 2+ , Nd 2+ , Pm 2+ , Eu 2+ , Gd 2+ , Tb 2+ , Ho 2+ , Er 2+ , Tm 2+ , Yb 2+ , Lu 2+ , or any combination thereof,
X 1 and X 2 are each independently at least one monovalent anion,
l, m, n, o, p, and q are each independently a real number greater than 0 and smaller than or equal to 10,
l+2m=n, and
o+2p=q,
and wherein the neutral defect of the first perovskite compound represented by Formula 1 and the neutral defect of the second perovskite compound represented by Formula 2 are each independently selected from one of the following (a) to (l):
(a) where the unit has a vacancy in which A is absent (V A );
(b) where the unit has a vacancy in which B is absent (V B );
(c) where the unit has a vacancy in which X is absent (V X );
(d) where A is further added to the unit cell (Ai);
(e) where B is further added to the unit cell (Bi);
(f) where X is further added to the unit cell (Xi);
(g) where a B site in the unit cell is substituted by A (A B );
(h) where an A site in the unit cell is substituted by B (B A );
(i) where an X site in the unit cell is substituted by A (A X );
(j) where an X site in the unit cell is substituted by B (B X );
(k) where an A site in the unit cell is substituted by X (X A ); and
(l) where a B site in the unit cell is substituted by X (X B ),
wherein A represents A 1 in Formula 1 and A 2 in Formula 2, B represents B 1 in Formula 1 and B 2 in Formula 2, and X represents X 1 in Formula 1 and X 2 in Formula 2.

4. The light-emitting device of claim 1 , wherein the hole transport region further comprises a hole control layer.

5. The light-emitting device of claim 4 , wherein the hole control layer is between the first electrode and the hole transport layer, or between the hole transport layer and the emission layer.

6. The light-emitting device of claim 1 , wherein the hole transport region further comprises:
a first hole control layer between the first electrode and the hole transport layer; and
a second hole control layer between the hole transport layer and the emission la

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Dongchan
• Seo Dongkyu
• Lee Byoungduk
• Cho Yoonhyeung
• Ju Yongchan
• Han Wonsuk

Classifications

• H10K85/351 Primary

  Metal complexes comprising lanthanides or actinides, e.g. comprising europium · CPC title

• H10K50/155 Primary

  comprising dopants · CPC title

• H10K50/165

  comprising dopants · CPC title

• H10K85/654

  comprising only nitrogen as heteroatom (H10K85/652 takes precedence) · CPC title

• H10K50/115

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title