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14.2: Invited Paper : Cadmium‐ and Indium‐Based Quantum‐Dot Materials
Author(s) -
CoeSullivan Seth
Publication year - 2015
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.10290
Subject(s) - narrowband , indium , quantum dot , efficient energy use , cadmium selenide , telecommunications , materials science , process engineering , optoelectronics , computer science , nanotechnology , electrical engineering , engineering
Currently, an exemption to the European Restriction of Hazardous Substances Directive (2011/65/EU) (RoHS2) is in place to enable manufacturers to bring to the market cadmium‐based quantum dot downconversion material in lighting and displays. The II‐VI downconversion materials (e.g. quantum dots), due to their narrowband, tunable, stable and efficient properties, will provide consumer products with the superior performance, efficiency, and net benefit to the environment for which there currently is no beneficial substitute available. In lighting, narrowband emission translates to warmer light sources with 20‐40% greater efficacy. Such products have already been placed on the market in the US. In the display market, narrowband emission translates to televisions, monitors, tablets and cellphones that can achieve 100% of color gamut (as defined by NTSC). This property has the added benefit of increased light throughput through the display, which can in turn reduce energy consumption for identical performance displays by 20% or more. While the cadmium selenide based QDs contain small quantities of cadmium, the net life cycle reductions to energy consumption, carbon emissions, and cadmium waste and emissions are compelling and outlined below. In addition, these new materials will reduce dependency on several EC recognized critical materials such as yttrium, europium, and indium. The net benefit to the environment is due to the system level increase in efficiency that is achieved using the II‐VI downconversion materials, due to their narrowband, tunable, and efficient nature.