Nanocrystal integrated light emitting diodes based on radiative and nonradiative energy transfer for the green gap
Demir, H. V.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/28606
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
- Conference Paper 
Recently the photometric conditions for ultra-efficient solid-state lighting have been discussed [1-2]. These studies show that a luminous efficacy of optical radiation at 408 lm/Wopt and a color rendering index (CRI) of 90 at a correlated color temperature (CCT) of 3000 K are achievable at the same time. For this purpose light emitting diodes (LEDs) emitting in blue, green, yellow, and red colors at 463, 530, 573, and 614 nm with relative optical power levels of 1/8, 2/8, 2/8, and 3/8, are required, respectively [1-2]. Although InxGa1-xN material system is capable to cover the whole visible by changing the In composition (x), it is technically extremely challenging to obtain efficient green/yellow light emitting diodes especially at those wavelengths (i.e., at 530 nm and 573 nm, respectively) due to reduced internal quantum efficiency [2-4]. Furthermore, by using the (Al xGa1-x)1-yInyP quaternary alloy it is also possible to cover from 650 nm to 580 nm. However, the efficiencies significantly decrease towards green. Therefore, there exists a significant gap in the green-yellow spectral regions (known as "the green gap") to make efficient light emitting diodes. To address this green gap problem, we propose and demonstrate proof-of-concept nanocrystal (NCs) hybridized green/yellow light emitting diodes that rely on both radiative energy transfer and nonradiative energy transfer (i.e., FRET-Förster resonance energy transfer) for color conversion on near-ultraviolet (near-UV) LEDs.
Showing items related by title, author, creator and subject.
Observation of selective plasmon-exciton coupling in nonradiative energy transfer: Donor-selective versus acceptor-selective plexcitons Ozel, T.; Hernandez-Martinez P.L.; Mutlugun, E.; Akin O.; Nizamoglu, S.; Ozel I.O.; Zhang Q.; Xiong Q.; Demir, H. V. (2013)We report selectively plasmon-mediated nonradiative energy transfer between quantum dot (QD) emitters interacting with each other via Förster-type resonance energy transfer (FRET) under controlled plasmon coupling either ...
Guzelturk B.; Martinez P.L.H.; Zhang Q.; Xiong Q.; Sun H.; Sun X.W.; Govorov A.O.; Demir H.V. (2014)In the past two decades, semiconductor quantum dots and wires have developed into new, promising classes of materials for next-generation lighting and display systems due to their superior optical properties. In particular, ...
Peptide-mediated constructs of quantum dot nanocomposites for enzymatic control of nonradiative energy transfer Seker, U.O.S.; Ozel, T.; Demir, H. V. (2011)A bottom-up approach for constructing colloidal semiconductor quantum dot (QDot) nanocomposites that facilitate nonradiative Förster-type resonance energy transfer (FRET) using polyelectrolyte peptides was proposed and ...