Power conversion and luminous efficiency performance of nanophosphor quantum dots on color-conversion LEDs for high-quality general lighting

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buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage827811-7en_US
dc.citation.spage827811-1en_US
dc.citation.volumeNumber8278en_US
dc.contributor.authorErdem, Talhaen_US
dc.contributor.authorNizamoglu, Sedaten_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.coverage.spatialSan Francisco, California, United Statesen_US
dc.date.accessioned2016-02-08T12:14:45Z
dc.date.available2016-02-08T12:14:45Z
dc.date.issued2012en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.descriptionConference name: 24–26 January 2012en_US
dc.descriptionConference name: SPIE OPTO, 2012en_US
dc.description.abstractFor high-quality general lighting, a white light source is required to exhibit good photometric and colorimetric performance along with a high level of electrical efficiency. For example, a warm white shade is desirable for indoors, corresponding to correlated color temperatures ≥4000 K, together with color rendering indices ≥90. Additionally, the luminous efficacy of optical radiation (LER) should be high, preferably ≥380 lm/W opt. Conventional white LEDs cannot currently satisfy these requirements simultaneously. On the other hand, color-conversion white LEDs (WLEDs) integrated with quantum dots (QDs) can simultaneously reach such high levels of photometric and colorimetric performance. However, their electrical efficiency performance and limits have been unknown. To understand their potential of luminous efficiency (lm/Welect), we modeled and studied different QD-WLED architectures based on layered QD films and QD blends, all integrated on blue LED chips. The architecture of red, yellow and green emitting QD films (in this order from the chip outwards) is demonstrated to outperform the rest. In this case, for photometrically efficient spectra, the maximum achievable LE is predicted to be 327 lm/W elect. Using a state-of-the-art blue LED reported with a power conversion efficiency (PCE) of 81.3%, the overall WLED PCE is shown to be 69%. To achieve LEs of 100, 150 and 200 lm/Welect, the required minimum quantum efficiencies of the color-converting QDs are found to be 39, 58 and 79%, respectively. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).en_US
dc.identifier.doi10.1117/12.907468en_US
dc.identifier.issn0277-786X
dc.identifier.urihttp://hdl.handle.net/11693/28228
dc.language.isoEnglishen_US
dc.publisherSPIEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1117/12.907468en_US
dc.source.titleProceedings of SPIEen_US
dc.subjectQuantum dot integrated white LEDsen_US
dc.subjectNanoluminophoresen_US
dc.subjectPower conversion efficiencyen_US
dc.subjectLuminous efficacy of optical radiationen_US
dc.subjectLuminous efficiencyen_US
dc.subjectColor rendering indexen_US
dc.subjectCorrelated color temperatureen_US
dc.subjectPhotometryen_US
dc.titlePower conversion and luminous efficiency performance of nanophosphor quantum dots on color-conversion LEDs for high-quality general lightingen_US
dc.typeConference Paperen_US

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Department of Electrical and Electronics Engineering
Institute of Materials Science and Nanotechnology (UNAM)