ELECTRIC DEVICE, AND DISPLAY DEVICE COMPRISING THE SAME

• US 20180062030A1
• Filed: 04/10/2017
• Published: 03/01/2018
• Est. Priority Date: 08/23/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHUNG, Dae Young, JANG, Eun Joo, CHO, Oul, KANG, Hyun A, KIM, Tae Hyung, WOO, Yun Sung, LEE, Jeong Hee
• Granted Patent: US 10,615,356 B2
• Time in Patent Office: Days
• CPC Class Codes: H10K 2102/321 Inverted OLED, i.e. having cathode between substrate and anode
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 50/816 Multilayers, e.g. transparent multilayers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/826 Multilayers, e.g. opaque multilayers
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses

Abstract

An electronic device includes a first electrode and a second electrode facing each other, an emission layer comprising a plurality of quantum dots, wherein the emission layer is disposed between the first electrode and the second electrode; a first charge auxiliary layer disposed between the first electrode and the emission layer; and an optical functional layer disposed on the second electrode on a side opposite the emission layer, wherein the first electrode includes a reflecting electrode, wherein the second electrode is a light-transmitting electrode, wherein a region between the optical functional layer and the first electrode comprises a microcavity structure, and a refractive index of the optical functional layer is greater than or equal to a refractive index of the second electrode.

Claims

1. An electronic device comprising

a first electrode and a second electrode facing each other;

an emission layer comprising a plurality of quantum dots, wherein the emission layer is disposed between the first electrode and the second electrode;

a first charge auxiliary layer disposed between the first electrode and the emission layer; and

an optical functional layer disposed on the second electrode on a side opposite the emission layer,

wherein the first electrode comprises a reflecting electrode,

wherein the second electrode is a light-transmitting electrode,

wherein a region between the optical functional layer and the first electrode comprises a microcavity structure, and

wherein a refractive index of the optical functional layer is greater than or equal to a refractive index of the second electrode.

2. The electronic device of claim 1, wherein the refractive index of the optical functional layer ranges from about 1.5 to about 2.5.

3. The electronic device of claim 1, wherein the optical functional layer comprises a triarylamine compound, a diarylamine compound, a carbazole compound, or a combination thereof.

4. The electronic device of claim 1, wherein emission layer emits a blue light, and

a thickness of the optical functional layer ranges from about 40 nanometers to about 60 nanometers.

5. The electronic device of claim 1, wherein the emission layer emits a red light, and

a thickness of the optical functional layer ranges from about 70 nanometers to about 95 nanometers.

6. The electronic device of claim 1, wherein the first charge auxiliary layer comprises at least one electron transport layer.

7. The electronic device of claim 6, wherein the at least one electron transport layer comprises a zinc oxide, a molybdenum oxide, a tungsten oxide, a nickel oxide, or a combination thereof.

8. The electronic device of claim 6, wherein the emission layer emits a blue light, and

a thickness of the at least one electron transport layer ranges from about 25 nanometers to about 45 nanometers.

9. The electronic device of claim 6, wherein the emission layer emits a red light, and

a thickness of the at least one electron transport layer ranges from about 45 nanometers to about 80 nanometers.

10. The electronic device of claim 1, wherein the first electrode comprises a first layer having a work function of about 4.2 electron volts to about 4.7 electron volts, and an optically opaque second layer.

11. The electronic device of claim 10, wherein the first layer comprises an indium-tin oxide, an indium-zinc oxide, magnesium-silver, aluminum-lithium, magnesium-indium, an indium oxide, a tin oxide, a gallium oxide, a zinc oxide, or a combination thereof, and the second layer comprises silver, aluminum, zinc, gold, iridium, copper, platinum, or a combination thereof.

12. The electronic device of claim 10, wherein the second layer comprises silver, aluminum, zinc, gold, iridium, copper, platinum, or a combination thereof.

13. The electronic device of claim 1, wherein the quantum dots comprise a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV compound, a Group II-III-VI compound, a Group I-II-IV-VI compound, or a combination thereof.

14. A display device comprising

a first electronic device comprising a first quantum dot emitting light in a first wavelength region;

a second electronic device comprising a second quantum dot emitting light in a shorter second wavelength region than the first wavelength region; and

and a third electronic device comprising a third quantum dot emitting light in a shorter third wavelength region than the second wavelength region,

wherein each of the first electronic device, the second electronic device, and the third electronic device further comprises;

a first electrode and a second electrode facing each other,

an emission layer disposed between the first electrode and the second electrode, wherein the emission layer comprises the first quantum dot, the second quantum dot, or the third quantum dot,

a charge transport layer disposed between the emission layer and the first electrode, and

an optical functional layer disposed on the second electrode on a side opposite the emission layer,

wherein the first electrode comprises a reflecting electrode,

wherein the second electrode is a light-transmitting electrode,

wherein a region between the optical functional layer and the first electrode comprises a microcavity structure,

wherein a refractive index of the optical functional layer is greater than or equal to a refractive index of the second electrode, and

wherein a thickness of the charge transport layer of the first electronic device, a thickness of the charge transport layer of the second electronic device, and a thickness of the charge transport layer of the third electronic device are different.

15. The display device of claim 14, wherein the refractive index of the optical functional layer ranges from about 1.5 to about 2.5.

16. The display device of claim 14, wherein the thickness of the charge transport layer of the first electronic device is greater than the thickness of the charge transport layer of the second electronic device and the thickness of the charge transport layer of the third electronic device.

17. The display device of claim 16, wherein the thickness of the charge transport layer of the third electronic device is less than the thickness of the charge transport layer of the second electronic device.

18. The display device of claim 14, wherein the thickness of the charge transport layer of the first electronic device ranges from about 45 nanometers to about 80 nanometers, and

the thickness of the charge transport layer of the third electronic device ranges from about 25 nanometers to about 45 nanometers.

19. The display device of claim 16, wherein the thickness of the optical functional layer of the first electronic device, the thickness of the optical functional layer of the second electronic device, and the thickness of the optical functional layer of the third electronic device are different.

20. The display device of claim 19, wherein the thickness of the optical functional layer of the first electronic device is greater than the thickness of the optical functional layer of the second electronic device and the thickness of the optical functional layer of the third electronic device.

21. The display device of claim 20, wherein the thickness of the optical functional layer of the third electronic device is less than the thickness of the optical functional layer of the second electronic device.