LIGHT-EMITTING APPARATUS AND DISPLAY DEVICE

• US 20190320517A1
• Filed: 09/29/2017
• Published: 10/17/2019
• Est. Priority Date: 09/29/2017
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: NAKANISHI, Youhei, KANEHIRO, Masayuki
• Application Number:
  US16/472,920
• Publication Number:
  US 20190320517A1
• Time in Patent Office: Days
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/353 Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

In a light-emitting apparatus, a blue light-emitting layer provided between the anode electrode and the cathode electrode includes blue QD phosphor particles emitting the first blue light by electro-luminescence. The light-emitting apparatus further includes a blue phosphor layer which receives the first blue light and emits a second blue light (a blue light with a longer peak wavelength than the first blue light).

Claims

1. A light-emitting apparatus provided with a first light-emitting layer between a first electrode and a second electrode,

wherein the first light-emitting layer includes quantum dot phosphor particles configured to emit first light by electro-luminescence,

the light-emitting apparatus further includes a wavelength converting member configured to emit second light which is blue light, upon receiving the first light, with a peak wavelength longer than that of the first light,

and further includes

a green light-emitting layer provided between the first electrode and the second electrode, and

a red light-emitting layer provided between the first electrode and the second electrode,

the green light-emitting layer includes green quantum dot phosphor particles configured to emit green light by electro-luminescence, and

the red light-emitting layer includes red quantum dot phosphor particles configured to emit red light by electro-luminescence.

2. The light-emitting apparatus according to claim 1,

wherein one of the first electrode and the second electrode is a light-transmissive electrode,

the wavelength converting member is disposed on a side of the light-transmissive electrode, and

when viewed from a normal direction of the light-transmissive electrode, the wavelength converting member is placed to cover the first light-emitting layer.

3. The light-emitting apparatus according to claim 2,

wherein when viewed from the normal direction of the light-transmissive electrode, a circumferential end of the wavelength converting member coincides with a circumferential end of the first light-emitting layer.

4. The light-emitting apparatus according to claim 1,

wherein the first light is blue light or near-ultraviolet light with a peak wavelength shorter than that of the second light.

6. The light-emitting apparatus according to claim 1,

wherein one of the first electrode and the second electrode is a light-transmissive electrode,

the wavelength converting member is disposed on a side of the light-transmissive electrode, and

when viewed from a normal direction of the light-transmissive electrode, the wavelength converting member is disposed not to cover the green light-emitting layer and the red light-emitting layer.

7. The light-emitting apparatus according to claim 1, further comprising:

a color filter configured to block at least a part of the first light having passed through the wavelength converting member.

8. The light-emitting apparatus according to claim 7,

wherein one of the first electrode and the second electrode is a light-transmissive electrode,

the color filter is disposed on a side of the light-transmissive electrode, and

when viewed from a normal direction of the light-transmissive electrode, the color filter is disposed to cover the wavelength converting member.

9. The light-emitting apparatus according to claim 8,

wherein when viewed from the normal direction of the light-transmissive electrode, a circumferential end of the color filter coincides with the circumferential end of the wavelength converting member.

10. The light-emitting apparatus according to claim 8, further comprising:

a green light-emitting layer provided between the first electrode and the second electrode; and

a red light-emitting layer provided between the first electrode and the second electrode,

wherein the green light-emitting layer includes green quantum dot phosphor particles configured to emit green light by electro-luminescence,

the red light-emitting layer includes red quantum dot phosphor particles configured to emit red light by electro-luminescence, and

the color filter is disposed not to cover the green light-emitting layer and the red light-emitting layer when viewed from the normal direction of the light-transmissive electrode.

11. A display device comprising the light-emitting apparatus according to claim 1.

12. The display device according to claim 11,

wherein a standard deviation of an average value of peak wavelengths in a wavelength spectrum of the second light is smaller than a standard deviation of an average value of peak wavelengths in a wavelength spectrum of the first light.

5. (canceled)

13. A light-emitting apparatus provided with a first light-emitting layer between a first electrode and a second electrode,

wherein the first light-emitting layer includes quantum dot phosphor particles configured to emit first light by electro-luminescence,

the light-emitting apparatus further includes a wavelength converting member configured to emit second light which is blue light, upon receiving the first light, with a peak wavelength longer than that of the first light, and

further includes a color filter configured to block at least a part of the first light having passed through the wavelength converting member,

one of the first electrode and the second electrode is a light-transmissive electrode,

the color filter is disposed on a side of the light-transmissive electrode,

when viewed from a normal direction of the light-transmissive electrode, the color filter is disposed to cover the wavelength converting member,

the light-emitting apparatus further includes

a green light-emitting layer provided between the first electrode and the second electrode, and

a red light-emitting layer provided between the first electrode and the second electrode,

the green light-emitting layer includes green quantum dot phosphor particles configured to emit green light by electro-luminescence,

the red light-emitting layer includes red quantum dot phosphor particles configured to emit red light by electro-luminescence, and

the color filter is disposed not to cover the green light-emitting layer and the red light-emitting layer when viewed from the normal direction of the light-transmissive electrode.

14. The light-emitting apparatus according to claim 13,

wherein one of the first electrode and the second electrode is a light-transmissive electrode,

the wavelength converting member is disposed on the side of the light-transmissive electrode, and

when viewed from the normal direction of the light-transmissive electrode, the wavelength converting member is placed to cover the first light-emitting layer.

15. The light-emitting apparatus according to claim 14,

wherein when viewed from the normal direction of the light-transmissive electrode, a circumferential end of the wavelength converting member coincides with a circumferential end of the first light-emitting layer.

16. The light-emitting apparatus according to claim 13,

wherein the first light is blue light or near-ultraviolet light with a peak wavelength shorter than that of the second light.

17. The light-emitting apparatus according to claim 13,

wherein when viewed from the normal direction of the light-transmissive electrode, a circumferential end of the color filter coincides with the circumferential end of the wavelength converting member.

18. A display device comprising the light-emitting apparatus according to claim 13.

19. The display device according to claim 18,

wherein a standard deviation of an average value of peak wavelengths in a wavelength spectrum of the second light is smaller than a standard deviation of an average value of peak wavelengths in a wavelength spectrum of the first light.