Quantum-dot-based white lighting planar source through downconversion by blue electroluminescence
- Quantum-dot-based white lighting planar source through downconversion by blue electroluminescence
- Ki-Heon Lee; Jong-Hoon Kim; 장호성; Young Rag Do; Heesun Yang
- electroluminescence; white LED; quantum dots
- Issue Date
- Optics letters
- VOL 39, NO 5, 1208-1211
- 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.
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