Samsung patents cadmium-free nanoparticles for brighter screens
Samsung has secured a patent for a light-emitting device that uses specific semiconductor nanoparticles to produce light. These particles are made from zinc, selenium, tellurium, and sulfur, avoiding the toxic metal cadmium while maintaining high efficiency. The design allows the device to emit light in the blue-to-yellow spectrum with a peak brightness efficiency of at least 40%.
In the filing’s own words
An electroluminescent device includes a first electrode and a second electrode spaced apart from each other, and a light emitting layer including semiconductor nanoparticles. The semiconductor nanoparticles do not contain cadmium, the semiconductor nanoparticles include zinc, selenium, tellurium, and sulfur, the semiconductor nanoparticles have a core-shell structure including a core including a first semiconductor nanocrystal and a shell disposed on the core, the first semiconductor nanocrystals include a first zinc chalcogenide containing sulfur, in the semiconductor nanoparticles, a mole ratio of sulfur to tellurium is greater than or equal to about 0.5:1 and less than or equal to about 110:1, and the semiconductor nanoparticles are configured to emit light having a maximum emission peak wavelength of greater than or equal to about 440 nanometers (nm) and less than or equal to about 580 nm, and the semiconductor nanoparticles have a quantum yield of greater than or equal to about 40%.
What exactly they claim (claim 1)
1. An electroluminescent device, comprising a first electrode and a second electrode spaced apart from each other, and a light emitting layer disposed between the first electrode and the second electrode, the light emitting layer comprising semiconductor nanoparticles, wherein the semiconductor nanoparticles do not comprise cadmium, the semiconductor nanoparticles comprise zinc, selenium, tellurium, and sulfur, the semiconductor nanoparticles have a core-shell structure comprising a core comprising a first semiconductor nanocrystal and a shell disposed on the core, the first semiconductor nanocrystals comprise a first zinc chalcogenide comprising sulfur, wherein in the semiconductor nanoparticles, a mole ratio of sulfur to tellurium is greater than or equal to about 0.5:1 and less than or equal to about 110:1, wherein the semiconductor nanoparticles are configured to emit light having a maximum emission peak wavelength of greater than or equal to about 440 nanometers and less than or equal to about 580 nanometers, wherein the semiconductor nanoparticles have a quantum yield of greater than or equal to about 40%, and wherein a mole ratio of selenium to tellurium is greater than or equal to about 25:1-1:1 and less than or equal to about 117:1.
Facts
- Company
- Samsung (Samsung Electronics Co., Ltd.)
- Official title
- Electroluminescent device and semiconductor nanoparticle
- Patent number
- US12742118B2
- Application number
- 17953533
- Filed
- Sep 27, 2022
- Granted
- Sep 22, 2026
- Inventors
- 5
- Claims
- 21
Classified under
C09K 11/883 Chemistry & metalsB82Y 30/00 Operations & transportC09K 11/55 Chemistry & metalsH10K 50/115 Electricity & electronicsMore from Samsung in Chips & hardware
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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.