Display panel and electronic apparatus including the same

Patent metadata

Field	Value
Publication number	US-2024099094-A1
Application number	US-202318457684-A
Country	US
Kind code	A1
Filing date	Aug 29, 2023
Priority date	Aug 29, 2022
Publication date	Mar 21, 2024
Grant date	—

Abstract

A display panel includes a color conversion panel and a light emitting panel, the light emitting panel includes a light emitting device that includes a first electrode, a second electrode, and a blue light emitting unit that includes an organic light emitting layer and is disposed between the first electrode and the second electrode and is configured to emit blue light. The color conversion panel includes a color conversion layer including at least two color conversion regions, and optionally, a partition wall defining that at least two regions, wherein the color conversion region includes a first region corresponding to a green pixel, a second region corresponding to a red pixel, and optionally a third region corresponding to a blue pixel. The first region includes a first composite including a matrix and a plurality of first semiconductor nanoparticles dispersed in the matrix, the first semiconductor nanoparticles includes a Group I-III-VI compound including silver, indium, gallium, and sulfur, and is configured to emit green light.

First claim

What is claimed is:

1 . A display panel comprising a color conversion panel, and a light emitting panel with a surface opposite a surface of the color conversion panel,
wherein the light emitting panel comprises a light emitting device and the light emitting device comprises a first electrode, a second electrode, and a blue light emitting unit disposed between the first electrode and the second electrode, and the blue light emitting unit is configured to emit blue light and comprises an organic light emitting layer; wherein the blue light has a peak emission wavelength of greater than or equal to about 450 nanometers and less than or equal to about 465 nanometers and a full width at quarter maximum (FWQM) of greater than or equal to about 20 nanometers and less than or equal to about 60 nanometers, wherein the color conversion panel comprises a color conversion layer comprising at least two color conversion regions, and optionally, a partition wall defining the at least two color conversion regions of the color conversion layer, wherein the color conversion region comprises a first region corresponding to a green pixel, and a second region corresponding to a red pixel, wherein the first region comprises a first composite including a matrix and a first semiconductor nanoparticle dispersed in the matrix, and optionally titanium oxide particles, wherein the first semiconductor nanoparticles comprises a Group I-III-VI compound comprising silver, indium, gallium, and sulfur, and is configured to emit green light, wherein the green light has a peak emission wavelength of greater than or equal to about 500 nanometers and less than or equal to about 550 nanometers, and a full width at half maximum (FWHM) of less than or equal to about 40 nanometers, and wherein the second region comprises a second composite including a matrix and a second semiconductor nanoparticle dispersed in the matrix, and optionally titanium oxide particles, wherein the second semiconductor nanoparticles comprise a Group III-V compound comprising indium and phosphorus, and is configured to emit red light, wherein the red light has a peak emission wavelength of greater than or equal to about 600 nanometers and less than or equal to about 650 nanometers.

2 . The display panel of claim 1 , wherein the organic light emitting layer comprises a host, a sensitizer, and an emitter, and
wherein the host comprises an electron transport host, a hole transport host, or a combination thereof, wherein the sensitizer comprises an organic metal compound that comprises iridium (Ir), platinum (Pt), palladium (Pd), osmium (Os), titanium (Ti), gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhenium (Re), rhodium (Rh), turbium (Tb), thallium (Tm), or any combination thereof, and wherein the emitter comprises a condensed ring compound.

3 . The display panel of claim 1 , wherein a decay time of the blue light emitting unit, as measured by time-resolved photoluminescence analysis, is from about 5 nanoseconds to about 10 microseconds.

4 . The display panel of claim 1 , wherein in a luminescent spectrum of the blue light, a ratio of an intensity at 500 nanometers to a maximum intensity is less than or equal to about 0.4:1.

5 . The display panel of claim 1 , wherein the light emitting panel further comprises a green light emitting unit, and the green light emitting unit is stacked with the blue light emitting unit.

6 . The display panel of claim 1 , wherein the first semiconductor nanoparticle exhibits a charge balance value defined by Equation 1 that is greater than or equal to about 0.9 and less than or equal to about 1.45:
charge balance value={[Ag]+3([In]+[Ga])}/2[S]  Equation 1
in Equation 1, [Ag], [In], [Ga], and [S] are molar amounts of silver, indium, gallium, and sulfur, respectively, in the first semiconductor nanoparticle.

7 . The display panel of claim 6 , wherein the charge balance value is greater than or equal to about 0.98 and less than or equal to about 1.2.

8 . The display panel of claim 1 , wherein the first semiconductor nanoparticle have a quantum yield of greater than or equal to about 70% and less than or equal to about 100% or a full width at half maximum of greater than or equal to about 10 nanometers and less than or equal to about 35 nanometers.

9 . The display panel of claim 1 , wherein at least about 97% of emission from the first semiconductor nanoparticles is band-edge emission, or
wherein in a photoluminescence spectrum of the first semiconductor nanoparticle, a relative band-edge emission intensity defined by Equation 2 is greater than about 20:
relative band-edge emission intensity=A1/A2  Equation 2

wherein A1 is an intensity at a maximum emission wavelength, and A2 is a maximum intensity in a tail wavelength range of the maximum emission wavelength+greater than or equal to about 80 nm.

10 . The display panel of claim 1 , wherein in the first semiconductor nanoparticle
a mole ratio of sulfur to a sum of silver, indium, and gallium, [S:(Ag+In+Ga)], is greater than or equal to about 0.65:1 and less than or equal to about 1.35:1; a mole ratio of a sum of indium and gallium to silver, [(In+Ga):Ag], is greater than or equal to about 1.8:1 and less than or equal to about 3.5:1; or a mole ratio of gallium to sulfur is greater than or equal to about 0.56:1 and less than or equal to about 1:1.

11 . The display panel of claim 1 , wherein the first semiconductor nanoparticle comprise a first semiconductor nanocrystal including silver, indium, gallium, and sulfur, and a semiconductor nanocrystal layer disposed on the first semiconductor nanocrystal, the semiconductor nanocrystal layer including zinc and sulfur.

12 . The display panel of claim 1 , wherein the second semiconductor nanoparticle has a size of greater than or equal to about 6 nanometers and less than or equal to about 8.5 nanometers.

13 . The display panel of claim 1 , wherein the second semiconductor nanoparticles comprise a semiconductor nanocrystal core comprising a Group III-V compound and a semiconductor nanocrystal shell comprising a zinc chalcogenide,
wherein the Group III-V compound comprises indium and phosphorus, wherein the zinc chalcogenide comprises zinc, selenium, and sulfur, and wherein the second semiconductor nanoparticle does not comprise cadmium.

14 . The display panel of claim 1 , wherein in the second semiconductor nanoparticle,
a mole ratio of sulfur to indium is greater than or equal to about 3:1 and less than or equal to about 6:1; a mole ratio of sulfur to selenium is greater than or equal to about 0.69:1 and less than or equal to about 0.89:1; or a mole ratio of zinc to indium of greater than or equal to about 10:1 and less than or equal to about 12.4:1.

15 . The display panel of claim 1 , wherein in the color conversion layer,
an amount ratio of silver (atomic %) to titanium (atomic %) is greater than or equal to about 0.1:1 and less than or equal to about 3:1; or an amount ratio of gallium (atomic %) to titanium (atomic %) is greater than or equal to about 0.1:1 and less than or equal to about 1.5:1.

16 . The display panel of claim 1 , wherein the blue light has a wavelength of greater than or equal to about 455 nanometers and less than or equal to about 460 nanometers, and the color conversion layer has a ratio of a blue light absorption of the first region to a blue light absorption of the second region that is in a range of from about 0.88:1 to about 1.2:1.

17 . The display panel of claim 1 , wherein the display panel has a luminance of white light

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Tae-Gon
• Kim Joonghyuk
• Kwak Seung-Yeon
• Kim Ji Whan
• Lee Sunghun
• Jun Shin Ae
• Chung Deuk Seok
• Choi Hyeonho

Classifications

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K2102/331

  Nanoparticles used in non-emissive layers, e.g. in packaging layer · CPC title

• H10K2101/20

  Delayed fluorescence emission · CPC title

• H10K50/19

  Tandem OLEDs · CPC title