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 () 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.
© 2014 Optical Society of AmericaFull Article | PDF Article
Gang Cheng, Marco Mazzeo, Stefania D'Agostino, Fabio Della Sala, Sonia Carallo, and Giuseppe Gigli
Opt. Lett. 35(5) 616-618 (2010)
Jaehoon Lim, Wan Ki Bae, Jeonghun Kwak, Seonghoon Lee, Changhee Lee, and Kookheon Char
Opt. Mater. Express 2(5) 594-628 (2012)
Wenyu Ji, Pengtao Jing, Yi Fan, Jialong Zhao, Yunjun Wang, and Xianggui Kong
Opt. Lett. 38(1) 7-9 (2013)