1 Ocak 2022 Dergi makalesi Açık Erişim

Onal, Asim; Eren, Guncem Ozgun; Sadeghi, Sadra; Melikov, Rustamzhon; Han, Mertcan; Karatum, Onuralp; Ozer, Melek Sermin; Jalali, Houman Bahmani; Dogru-Yuksel, Itir Bakis; Yilgor, Iskender; Metin, Onder; Nizamoglu, Sedat

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/259421</identifier>
  <creators>
    <creator>
      <creatorName>Onal, Asim</creatorName>
      <givenName>Asim</givenName>
      <familyName>Onal</familyName>
      <affiliation>Koc Univ, Grad Sch Mat Sci &amp; Engn, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Eren, Guncem Ozgun</creatorName>
      <givenName>Guncem Ozgun</givenName>
      <familyName>Eren</familyName>
      <affiliation>Koc Univ, Grad Sch Biomed Sci &amp; Engn, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Sadeghi, Sadra</creatorName>
      <givenName>Sadra</givenName>
      <familyName>Sadeghi</familyName>
    </creator>
    <creator>
      <creatorName>Melikov, Rustamzhon</creatorName>
      <givenName>Rustamzhon</givenName>
      <familyName>Melikov</familyName>
    </creator>
    <creator>
      <creatorName>Han, Mertcan</creatorName>
      <givenName>Mertcan</givenName>
      <familyName>Han</familyName>
      <affiliation>Koc Univ, Dept Elect &amp; Elect Engn, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Karatum, Onuralp</creatorName>
      <givenName>Onuralp</givenName>
      <familyName>Karatum</familyName>
      <affiliation>Koc Univ, Dept Elect &amp; Elect Engn, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Ozer, Melek Sermin</creatorName>
      <givenName>Melek Sermin</givenName>
      <familyName>Ozer</familyName>
      <affiliation>Koc Univ, Dept Chem, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Jalali, Houman Bahmani</creatorName>
      <givenName>Houman Bahmani</givenName>
      <familyName>Jalali</familyName>
    </creator>
    <creator>
      <creatorName>Dogru-Yuksel, Itir Bakis</creatorName>
      <givenName>Itir Bakis</givenName>
      <familyName>Dogru-Yuksel</familyName>
      <affiliation>Koc Univ, Grad Sch Biomed Sci &amp; Engn, TR-34450 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Yilgor, Iskender</creatorName>
      <givenName>Iskender</givenName>
      <familyName>Yilgor</familyName>
    </creator>
    <creator>
      <creatorName>Metin, Onder</creatorName>
      <givenName>Onder</givenName>
      <familyName>Metin</familyName>
    </creator>
    <creator>
      <creatorName>Nizamoglu, Sedat</creatorName>
      <givenName>Sedat</givenName>
      <familyName>Nizamoglu</familyName>
    </creator>
  </creators>
  <titles>
    <title>High-Performance White Light-Emitting Diodes Over 150 Lm/W Using Near-Unity-Emitting Quantum Dots In A Liquid Matrix</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2022</publicationYear>
  <dates>
    <date dateType="Issued">2022-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/259421</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1021/acsphotonics.1c01805</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">In the next decade, we will witness the replacement of a majority of conventional light sources with light-emitting diodes (LEDs). Efficient LEDs other than phosphors can enhance their functionality and meet different lighting needs. Quantum dots (QDs) have high potential for future LED technology due to their sensitive band-gap tuning via the quantum confinement effect and compositional control, high photoluminescence quantum yield (PLQY), and mass-production capacity. Herein, we demonstrate white LEDs using QDs that reach over 150 lumens per electrical Watt. For that we synthesized green- and red-emitting ZnCdSe/ZnSe core/shell QDs by low-temperature nucleation, high-temperature shell formation, and postsynthetic trap-state removal. Their cadmium concentration is lower than 100 ppm, satisfying the current EU RoHS regulations, and their PLQY reaches a high level of 94%. The PLQY of QDs is maintained within the device on blue LED via liquid injection, and their integration at optimized optical densities leads to 129.6 and 170.4 lm/W for red-green-blue (RGB)- and green-blue (GB)-based white LEDs, respectively. Our simulations further showed that an efficiency level of over 230 lm/W is achievable using ultraefficient blue LED pumps. The simple fabrication and high performance of white LEDs using QD liquids show high promise for next-generation lighting devices.</description>
  </descriptions>
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