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KR-20260064818-A - Quantum dot, and optical member and electronic apparatus including the quantum dot

KR20260064818AKR 20260064818 AKR20260064818 AKR 20260064818AKR-20260064818-A

Abstract

According to one aspect, a quantum dot is provided comprising: a core including a group I element, a group III element, a group VI element, and gallium (Ga); a first shell including a group I element, a group III element, a group VI element, and gallium (Ga) and covering the core; and a second shell covering the first shell; wherein the bandgap energies of the core, the first shell, and the second shell satisfy the following equations (1) and (2): EB SHELL1 < EB CORE (1) EB CORE < EB SHELL2 (2) In equations (1) and (2), EB CORE is the bandgap energy of the core, EB SHELL1 is the bandgap energy of the first shell, and EB SHELL2 is the bandgap energy of the second shell.

Inventors

  • 이동희
  • 박재현
  • 임희운

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260508
Application Date
20241029

Claims (20)

  1. A core containing Group I elements, Group III elements, Group VI elements, and gallium (Ga); A first shell covering the core, comprising a group I element, a group III element, a group VI element, and gallium (Ga); and A second shell covering the first shell; comprising, The bandgap energies of the core, the first shell, and the second shell satisfy the following equations (1) and (2): EB SHELL1 < EB CORE (1) EB CORE < EB SHELL2 (2) Among equations (1) and (2), EB CORE is the bandgap energy of the above core, and EB SHELL1 is the bandgap energy of the first shell, and EB SHELL2 is the bandgap energy of the second shell.
  2. In paragraph 1, A quantum dot in which the group I elements of the core and the first shell are independently copper (Cu), silver (Ag), gold (Au), or a combination thereof.
  3. In paragraph 1, A quantum dot in which the group I element of the core and the group I element of the first shell are different from each other.
  4. In paragraph 1, A quantum dot in which the group III elements of the core and the first shell are independently aluminum (Al), indium (In), thallium (Tl), or a combination thereof.
  5. In paragraph 1, A quantum dot in which the group VI elements of the core and the first shell are independently sulfur (S), selenium (Se), tellurium (Te), or a combination thereof.
  6. In paragraph 1, The above core is a quantum dot comprising Ag, In, Ga and S.
  7. In paragraph 1, The first shell above is a quantum dot comprising Cu, In, Ga and S.
  8. In paragraph 1, The above core has a composition of AgIn x Ga 1-x S (0<x<1), and The first shell is a quantum dot having the composition of CuIn y Ga 1-y S (0<y<1).
  9. In paragraph 8, Quantum dot satisfying any one of the following conditions (1) to (7): (1) If the core has a composition of AgIn x Ga 1-x S (0<x≤0.2), the first shell has a composition of CuIn y Ga 1-y S (0<y<1); (2) If the core has a composition of AgIn x Ga 1-x S (0.2 < x ≤ 0.3), the first shell has a composition of CuIn y Ga 1-y S (0.1 ≤ y <1); (3) If the core has a composition of AgIn x Ga 1-x S (0.3<x≤0.4), the first shell has a composition of CuIn y Ga 1-y S (0.2≤y<1); (4) If the core has a composition of AgIn x Ga 1-x S (0.4 < x ≤ 0.6), the first shell has a composition of CuIn y Ga 1-y S (0.3 ≤ y <1); (5) If the core has a composition of AgIn x Ga 1-x S (0.6 < x ≤ 0.7), the first shell has a composition of CuIn y Ga 1-y S (0.4 ≤ y <1); (6) If the core has a composition of AgIn x Ga 1-x S (0.7 < x ≤ 0.8), the first shell has a composition of CuIn y Ga 1-y S (0.5 ≤ y <1); (7) When the core has a composition of AgIn x Ga 1-x S (0.8<x<1), the first shell has a composition of CuIn y Ga 1-y S (0.6≤y<1).
  10. In paragraph 1, The above second shell is a quantum dot comprising a group II-VI compound, a group III-VI compound, or any combination thereof.
  11. In paragraph 1, The second shell comprises a quantum dot including ZnS, ZnSe, ZnTe, ZnO, ZnMg, ZnMgSe, ZnMgS, ZnMgAl, GaSe, GaTe, GaP, GaAs, GaSb, InAs, InSb, AlP, AlAs, AlSb, MnS, MnSe, MgS, and MgSe.
  12. In paragraph 1, A quantum dot having a full width at half maximum (FW) of the photoluminescence (PL) spectrum for incident light of 450 nm wavelength of the above quantum dot, which is 60 nm or less.
  13. In paragraph 1, A quantum dot having a core diameter in the range of 2 nm to 8 nm.
  14. In paragraph 1, A quantum dot, wherein the thickness of the first shell is in the range of 1 nm to 2 nm and the thickness of the second shell is in the range of 0.3 nm to 2 nm.
  15. In paragraph 1, The surface of the above quantum dot comprises an organic ligand or a metal halide.
  16. An optical member comprising a quantum dot according to any one of claims 1 to 15.
  17. An electronic device comprising a quantum dot according to any one of claims 1 to 15.
  18. In Paragraph 17, light source; and A color conversion member positioned in the path of light emitted from the above light source; Includes, The above quantum dot is an electronic device included in the above color conversion member.
  19. An electronic device including the electronic device of paragraph 17.
  20. In Paragraph 19, An electronic device that is one of a flat panel display, a curved display, a computer monitor, a medical monitor, a television, a billboard, indoor lighting, outdoor lighting, a signal light, a head-up display, a fully transparent display, a partially transparent display, a flexible display, a rollable display, a foldable display, a stretchable display, a laser printer, a telephone, a mobile phone, a tablet, a phablet, a personal information terminal (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro display, a 3D display, a virtual reality display or an augmented reality display, a vehicle, a video wall including multiple displays tiled together, a theater screen, a stadium screen, a light therapy device, and a signboard.

Description

Quantum dot, optical member and electronic apparatus including the quantum dot The invention relates to a quantum dot, an optical member including the quantum dot, and an electronic device including the quantum dot. Quantum dots are nanoscale semiconductor nanocrystals that exhibit a quantum confinement effect. By controlling the size and composition of the nanocrystals, they can have different energy bandgaps and, accordingly, emit light of various emission wavelengths. These quantum dots can be used in various ways in optical components and various electronic devices, and there is a demand for quantum dots that have a narrow emission full width at desired wavelengths and excellent quantum efficiency. FIG. 1 is a schematic diagram showing a cross-section of a quantum dot according to one embodiment. FIG. 2 is a graph conceptually showing the bandgap energies of the core, first shell, and second shell of a quantum dot according to one embodiment. FIG. 3 is a schematic diagram showing the structure of an electronic device according to one embodiment. FIG. 4 is a schematic diagram showing the structure of an electronic device according to another embodiment. FIG. 5 is a perspective view schematically illustrating an electronic device including a light-emitting element according to one embodiment of the present invention. FIG. 6 is a schematic diagram illustrating the exterior of a vehicle as an electronic device including a light-emitting element according to one embodiment of the present invention. FIGS. 7a to 7c are schematic drawings illustrating the interior of a vehicle according to various embodiments of the present invention. Figure 8 is a graph showing the photoluminescence (PL) spectra of quantum dots prepared in Comparative Test Examples 1 and 2. Figure 9 is a graph showing the photoluminescence (PL) spectra of quantum dots prepared in Comparative Test Example 1, Test Examples 1 and 2. Figure 10 is a graph showing the quantum yield (QY) retention rate according to the light exposure time of quantum dots of Comparative Test Examples 1 to 3 and Test Examples 1 and 2. The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms. In this specification, terms such as "first," "second," etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another. In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added. For example, unless otherwise limited, terms such as "comprising" or "having" may mean both cases where the invention consists only of the features or components described in the specification and cases where additional components are included. In this specification, "Group I" may include Group IA and Group IB elements of the IUPAC periodic table, and Group I elements may include, for example, silver (Ag), copper (Cu), etc. In this specification, "Group II" may include Group II elements and Group IIB elements of the IUPAC periodic table, and Group II elements may include, for example, magnesium (Mg), calcium (Ca), zinc (Zn), cadmium (Cd), mercury (Hg), etc. In this specification, "Group III" may include elements of Group IIIA and Group IIIB of the IUPAC periodic table, and the elements of Group III may include, for example, aluminum (Al), gallium (Ga), indium (In), thallium (Tl), etc. In this specification, "Group VI" may include elements of Group VIA and Group VIB of the IUPAC periodic table, and Group VI elements may include, for example, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), etc. [Quantum Dot] A quantum dot according to one embodiment comprises: a core comprising a group I element, a group III element, a group VI element, and gallium (Ga); a first shell comprising a group I element, a group III element, a group VI element, and gallium (Ga) and covering the core; and a second shell covering the first shell. The bandgap energies of the core, the first shell, and the second shell satisfy the following equations (1) and (2). EB SHELL1 < EB CORE (1) EB CORE < EB SHELL2 (2) Among equations (1) and (2), EB CORE is the bandgap energy of the above core, and EB SHELL1 is the bandgap energy of the first shell, and EB SHELL2 is the bandgap energy of the second shell. FIG. 1 is a schematic cross-sectional view of a quantu