Abstract
Colloidal CdSe quantum dot (QD) phosphors have attracted considerable attention as green and red phosphors for blue backlight downconversion in next-generation liquid-crystal displays because of their excellent emission features including tunable emission wavelength and narrow emission bands. Alternatives to CdSe, which do not contain toxic cadmium, are strongly desired to ensure safety and reduce the environmental load of consumer products. Herein, we synthesized colloidal Zn(Te,Se)/ZnS core/shell QDs and demonstrated narrow-band green photoluminescence (PL) emission. A full width at half-maximum of 30 nm was achieved for PL emission at 535 nm from Zn(Te0.77Se0.23)/ZnS core/shell QDs with a core QD diameter of 4.3 nm. This emission characteristic was as good as that of CdSe QDs.
Highlights
Colloidal semiconductor quantum dots (QDs) exhibit excellent luminescence properties, such as narrow emission bands arising from exciton recombination and controllable emission energy owing to quantum size effects.[1]
Lightemitting devices based on QDs are still under development, QDs are currently being used as phosphors for blue light-emitting diodes (LEDs) backlight downconversion in commercial liquid-crystal displays (QD-LCDs).[6−8] Because the QD phosphors enable the realization of a wide color range and excellent energy efficiency, they are suitable to the next-generation displays, responding to the switching from full-high-definition to ultrahigh-definition television broadcasts
InP QDs are a promising alternative to CdSe QDs; InP QDs have not yet managed to replace CdSe QDs because their PLQY and emission bandwidth remain unsuitable have emfoerrgepdracatsicnaol natopxpilcicaalttieornnsa.9tiveCsu.1I2n−S124-bTahseedII−QVDIsbased chalcogenides are easier to synthesize than III−V
Summary
Colloidal semiconductor quantum dots (QDs) exhibit excellent luminescence properties, such as narrow emission bands arising from exciton recombination and controllable emission energy owing to quantum size effects.[1]. The full width at half-maximum (fwhm) of their emission bands is typically less than 40 nm, and high quantum efficiencies (photoluminescence quantum yield, PLQY) are achievable (>85%).[6,9,10] cadmium is a toxic element and its use is highly restricted to
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