Light-emitting device and an electronic apparatus including the same

Patent metadata

Field	Value
Publication number	US-2022173343-A1
Application number	US-202117535521-A
Country	US
Kind code	A1
Filing date	Nov 24, 2021
Priority date	Nov 27, 2020
Publication date	Jun 2, 2022
Grant date	—

Abstract

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer including an emission layer between the first electrode and the second electrode, wherein: the interlayer further includes a hole transport region located between the first electrode and the emission layer; the first electrode includes tin oxide in an amount greater than about 0 wt % and equal to or less than about 8 wt % with respect to 100 wt % of the first electrode; and the hole transport region includes a compound represented by Formula 1, as defined herein.

First claim

What is claimed is:

1 . A light-emitting device comprising:
a first electrode; a second electrode facing the first electrode; and an interlayer comprising an emission layer between the first electrode and the second electrode, wherein: the interlayer further comprises a hole transport region located between the first electrode and the emission layer; the first electrode comprises tin oxide in an amount greater than about 0 wt % and equal to or less than about 8 wt % with respect to 100 wt % of the first electrode; and the hole transport region comprises a compound represented by Formula 1:
(M)(X) n   Formula 1

wherein, in Formula 1, M is a transition metal, X is a halogen element, and n is an integer from 1 to 4.

2 . The light-emitting device of claim 1 , wherein the first electrode further comprises indium oxide, indium zinc oxide, zinc oxide, or any combination thereof.

3 . The light-emitting device of claim 1 , wherein the tin oxide is present in an amount greater than about 1 wt % and equal to or less than about 7 wt % with respect to 100 wt % of the first electrode.

4 . The light-emitting device of claim 1 , wherein the first electrode has a work function with an absolute value of about 5.15 eV to about 5.4 eV.

5 . The light-emitting device of claim 1 , wherein M is titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, zinc or any combination thereof.

6 . The light-emitting device of claim 1 , wherein M is copper, silver, gold, or any combination thereof.

7 . The light-emitting device of claim 1 , wherein X is F, Cl, Br, I, or any combination thereof.

8 . The light-emitting device of claim 1 , wherein the compound represented by Formula 1 is CuF, CuCl, CuBr, CuI, AgF, AgCl, AgBr, or AgI.

9 . The light-emitting device of claim 1 , wherein the hole transport region further comprises a hole transport material.

10 . The light-emitting device of claim 9 , wherein the compound represented by Formula 1 is present in an amount from about 0.01 parts by weight to about 49.99 parts by weight based on 100 parts by weight of the hole transport material.

11 . The light-emitting device of claim 1 , wherein the compound represented by Formula 1 comprises a p-dopant.

12 . The light-emitting device of claim 1 , wherein the hole transport region has a lowest unoccupied molecular orbital energy level with an absolute value of about 2.0 eV to about 2.5 eV.

13 . The light-emitting device of claim 1 , wherein the first electrode has a work function with first absolute value and the lowest unoccupied molecular orbital energy level of the hole transport region has second absolute value less than the first absolute value.

14 . The light-emitting device of claim 1 , wherein the first electrode has a work function with a first absolute value and the hole transport region a lowest unoccupied molecular orbital energy level with a second absolute value and the difference between the first absolute value and the second absolute value is about 2.65 eV to about 3.4 eV.

15 . The light-emitting device of claim 1 , wherein the hole transport region comprises a hole injection layer,
the hole injection layer directly contacts the first electrode, and comprises the compound represented by Formula 1.

16 . The light-emitting device of claim 1 , wherein the interlayer further comprises an electron transport region between the emission layer and the second electrode, and comprises a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

17 . The light-emitting device of claim 16 , wherein at least one of the hole transport region and the emission layer comprises an arylamine-containing compound, an acridine-containing compound, a carbazole-containing compound, or any combination thereof, or
at least one of the emission layer and the electron transport region comprises a silicon-containing compound, a phosphine oxide-containing compound, a sulfur oxide-containing compound, a phosphorus oxide-containing compound, a triazine-containing compound, a pyrimidine-containing compound, a pyridine-containing compound, a dibenzofuran-containing compound, a dibenzothiophene-containing compound, or any combination thereof.

18 . An electronic apparatus comprising the light-emitting device of claim 1 .

19 . The electronic apparatus of claim 18 , further comprising a thin-film transistor having a source electrode and a drain electrode, and
the first electrode of the light-emitting device is electrically connected to at least one of the source electrode and the drain electrode of the thin-film transistor.

20 . The electronic apparatus of claim 18 , further comprising a color filter, a color conversion layer, a touch screen layer, a polarizing layer, or any combination thereof.

Assignees

• Samsung Display Co Ltd

Inventors

• Shin Junyong
• Park Yeongrong
• Seo Dongkyu
• Yoo Byeongwook
• Lee Daeho
• Lee Byungseok

Classifications

• H10K59/8051

  Anodes · CPC title

• H10K50/17

  Carrier injection layers · CPC title

• H10H20/832

  characterised by their material · CPC title

• H10H20/822

  Materials of the light-emitting regions · CPC title

• H10H20/819 Primary

  characterised by their shape, e.g. curved or truncated substrates · CPC title