Electroluminescent element, light-emitting device, and method for producing electroluminescent element
AssigneesSharp Kabushiki Kaisha, Toppan Inc.
InventorsYusuke Sakakibara, Kazuki Goto, Masaki Yamamoto, Tatsuya Ryohwa, Mikihiro Takasaki, Yuka Takamizuma, Hironori Matsuzawa
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Abstract
A light-emitting element includes an anode electrode, a QD layer containing QDs, and a cathode electrode, in which the QDs have a core-shell structure including a core and a shell and are Cd-free QDs that emit blue light, the QDs contain halogen elements, and an external quantum efficiency percentage of the light-emitting element is 7% or more.
Claims12
An electroluminescent element comprising:
- a first electrode;
- a second electrode;
- and
- a quantum dot light-emitting layer containing a quantum dot and provided between the first electrode and the second electrode, wherein
- the quantum dot is a Cd-free quantum dot having a core-shell structure including a core and a shell and configured to emit blue light,
- the shell is formed by blending a shell material with an acidic compound and a zinc halide compound,
- the quantum dot contains a halogen element, and
- the shell is formed on a surface of the core in multiple steps by forming a film using a shell material blended with an acidic compound and not blended with a zinc halide compound, followed by forming a film using a shell material blended with both an acidic compound and a zinc halide compound.
A method for manufacturing an electroluminescent element including a first electrode, a second electrode, and a quantum dot light-emitting layer containing a quantum dot being Cd-free containing a halogen element, and provided between the first electrode and the second electrode, the method comprising:
- forming the first electrode;
- forming the quantum dot light-emitting layer containing the quantum dot;
- forming the second electrode;
- and
- synthesizing the quantum dot prior to the forming the quantum dot light-emitting layer, wherein
- the synthesizing the quantum dot includes:
- producing a core, and
- forming a shell on a surface of the core, and
- in the forming a shell;
- a raw material for the shell is blended with an acidic compound and a zinc halide compound, and
- the shell is formed on the surface of the core in multiple steps by forming a film using a shell material blended with an acidic compound and not blended with a zinc halide compound, followed by forming a film using a shell material blended with both an acidic compound and a zinc halide compound.
Dependencies are inferred from the claim text.