Borosilicate Light Extraction Region

Patent metadata

Field	Value
Publication number	US-2022123266-A1
Application number	US-202117562500-A
Country	US
Kind code	A1
Filing date	Dec 27, 2021
Priority date	Mar 7, 2019
Publication date	Apr 21, 2022
Grant date	—

Abstract

The invention relates to a light extraction substrate having a light extraction layer. The light extraction layer includes boron, boroate, and/or borosilicate as well as nanoparticles.

First claim

The invention claimed is:

1 . An organic light emitting device comprising:
a substrate having a first surface and a second surface; a light extraction layer over the first surface of the substrate, wherein the light extraction layer comprises a borosilicate layer; a transparent conductive oxide over the light extraction layer; an emissive layer; and a cathode.

2 . The organic light emitting device of claim 1 , wherein the light extraction layer further comprises a nanoparticle.

3 . The organic light emitting device of claim 2 , wherein the nanoparticle is titania.

4 . The organic light emitting device of claim 1 , wherein the light extraction layer has a thickness of at most 2.25 μm.

5 . The organic light emitting device of claim 1 , wherein the light extraction layer has an average surface roughness of less than 5 nm.

6 . The organic light emitting device of claim 1 , further comprising an external light extraction layer positioned over the second surface of the substrate having an average surface roughness of at least 50 nm.

7 . The organic light emitting device of claim 6 , wherein the surface roughness of the external light extraction layer is at least 50 nm and at most 500 nm.

8 . The organic light emitting device of claim 6 , wherein the external light extraction layer has a thickness in the range of 10 nm to 500 nm.

9 . The organic light emitting device of claim 6 , wherein the external light extraction layer is formed by texturing the second surface of the glass.

10 . The organic light emitting device of claim 1 , further comprising a haze of at least 20%.

11 . The organic light emitting device of claim 1 , further comprising an anode deposited over the first surface of the glass.

12 . The organic light emitting device of claim 1 , further comprising an underlayer coating stack deposited over the first surface of the glass.

13 . A method of making a light extraction substrate comprising:
pouring a glass melt onto a molten metal bath; and applying a boron precursor over the glass melt while the glass melt has a temperature of at least 600° C.

14 . The method of claim 13 , wherein the temperature of the glass melt is no more than 725° C.

15 . The method of claim 13 , wherein the boron precursor is applied to the glass melt to produce a borosilicate.

16 . The method of claim 15 , wherein the boron precursor is applied without a silicon precursor to produce the borosilicate.

17 . The method of claim 15 , further comprising applying a silicon precursor to produce the borosilicate.

18 . The method of claim 13 , further comprising applying a nanoparticle precursor to form a nanoparticle with a layer formed by the boron precursor.

19 . The method of claim 18 , wherein the nanoparticle precursor comprises titanium tetrachloride.

20 . A light extraction substrate comprising a glass, the glass comprising a first surface and a second surface; and a light extraction layer over the first surface, wherein the light extraction layer comprises borosilicate, and wherein the borosilicate resides over the first surface.

Assignees

• Vitro Flat Glass Llc

Inventors

• Hung Cheng-Hung
• Mccamy James W

Classifications

• H10K50/854

  comprising scattering means · CPC title

• G02B5/0268 Primary

  characterized by the fabrication or manufacturing method · CPC title

• C03C2217/477

  Titanium oxide · CPC title

• C03C17/007

  containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase · CPC title

• C03C2217/452

  Glass · CPC title