High-Performance White Light-Emitting Diodes over 150 lm/W Using Near-Unity-Emitting Quantum Dots in a Liquid Matrix

Autor: Asim Onal, Guncem Ozgun Eren, Sadra Sadeghi, Rustamzhon Melikov, Mertcan Han, Onuralp Karatum, Melek Sermin Ozer, Houman Bahmani Jalali, Itir Bakis Dogru-Yuksel, Iskender Yilgor, Önder Metin, Sedat Nizamoglu
Přispěvatelé: Önal, Asım, Eren, Güncem Özgün, Sadeghi, Sadra, Melikov, Rustamzhon, Han, Mertcan, Karatum, Onuralp, Özer, Melek Şermin, Jalali, Houman Bahmani, Doğru Yüksel, Itır Bakış, Yılgör, İskender (ORCID 0000-0002-7756-4192 & YÖK ID 24181), Metin, Önder (ORCID 0000-0003-1622-4992 & YÖK ID 46962), Nizamoğlu, Sedat (ORCID 0000-0003-0394-5790 & YÖK ID 130295), Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM), Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM), Koç University Boron and Advanced Materials Application and Research Center (KUBAM) / Koç Üniversitesi Bor ve İleri Malzemeler Uygulama ve Araştırma Merkezi (KUBAM), Graduate School of Sciences and Engineering, College of Sciences, College of Engineering, Department of Materials Science and Engineering, Department of Biomedical Sciences and Engineering, Department of Electrical and Electronics Engineering, Department of Chemistry
Rok vydání: 2022
Předmět:
Zdroj: ACS Photonics
ISSN: 2330-4022
Popis: 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.
Scientific and Technological Research Council of Turkey (TÜBİTAK); Turkish Academy of Sciences (TUBA-GEBIP) The Young Scientist Award Program; Science Academy of Turkey (BAGEP) The Young Scientist Award Program; Bilim Kahramanlari Dernegi The Young Scientist Award
Databáze: OpenAIRE
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