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Significance of Green QDots...The Green Valley of Death

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DDhawk   Saturday, 08/09/14 12:40:37 AM
Re: None
Post # of 61684 
Significance of Green QDots...The Green Valley of Death

"Another problem many researchers continue to grapple with is how to create a vibrantly white LED for use in specific applications. The reds and the blues are up to the task, but the greens have continued to frustrate, leading investigators to christen this stubborn problem the “green hole” or the “green valley of death........."ideally what is needed is a green LED with a peak wavelength of 540 nm and efficacy of at least 60 lm/W. Right now, the only viable alternative seems to be a phosphor-coated LED with a deep blue emission that peaks at 450 nm or so”..........If quantum dot manufacturers could produce a phosphor that meets those benchmarks, the product could become competitive in a number of uses, including LCD backlighting and general illumination.
Researchers are addressing this, but the “if” is particularly big. Ashdown said that the quantum dot phosphor would have to have numerous capabilities, including a high quantum yield (in the range of 80 to 90 percent), a narrow emission spectral bandwidth (with broad absorption) and minimal temperature dependency. It also must be free from concentration quenching and clustering and have minimal long-term degradation. In addition, it would have to be RoHS-compliant
" (in the EU anyway)
This, from a slightly-dated article on QD's: http://www.photonics.com/Article.aspx?AID=29421
*So , beyond the obvious (find a need & fill it), yet highly significant feat of making commercially viable green QD's a reality , I should think this also goes a long way toward laying the groundwork for a fullscreen RGB gamut QDotLED display..not just using red & blue QDots as an ancillary enhancement to LCD's , but a 'Fullscreen' RGB QDLED display...I reckon' ;)


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