Lee, Ki-Heon Kim, Jong-Hoon Jang, Ho Seong Do, Young Rag Yang, Heesun 2024-01-20T10:04:29Z 2024-01-20T10:04:29Z 2021-09-04 2014-03-01 0146-9592 https://pubs.kist.re.kr/handle/201004/127016 We report the unprecedented fabrication of a planar white lighting quantum dot light-emitting diode (QD-LED) through integrating a CdZnS QD-based blue electroluminescence (EL) device with a free-standing polymethyl methacrylate (PMMA) composite film embedded with orange-emitting Cu-In-S (CIS) green-greenish yellow-emitting Cu-In-Ga-S (CIGS) QDs. The hybrid device successfully generates bicolored white emission that comprises blue EL and downconverted QD photoluminescence. The hybrid QD-LEDs loaded with the composite film embedded with one type of QDs exhibit a limited white spectral coverage, consequently producing low values (<65) in color rendering index (CRI). Thus, the QD-PMMA film consisting of a blend of green CIGS and orange CIS QD downconverters is applied for obtaining a higher-CRI white light through the spectral extension, resulting in a much improved CRI of 75-77. Various EL performances of the hybrid planar white device versus the reference blue QD-LED are also characterized in details. (C) 2014 Optical Society of America English OPTICAL SOC AMER EMITTING-DIODES EFFICIENT DEVICES Quantum-dot-based white lighting planar source through downconversion by blue electroluminescence Article 10.1364/OL.39.001208 1 OPTICS LETTERS, v.39, no.5, pp.1208 - 1211 OPTICS LETTERS 39 5 1208 1211 scie scopus 000332233300027 2-s2.0-84897378770 Optics Optics Article EMITTING-DIODES EFFICIENT DEVICES electroluminescence white LED quantum dots