Page 21 - European Energy Innovation - Autumn 2016 publication

Autumn 2016 European Energy Innovation
The NEWLED project
The European project NEWLED
(Nanostructured Efficient
White LEDs based on short- fabricated and evaluated by the
period superlattices and
quantum dots), launched in 2012, aims
to develop high-efficiency and high-
brightness monolithic and hybrid all-
semiconductor white GaN-based light-
emitting-diodes (LEDs). This €11.8M
FP7-IP project involving 15 leading
academic and industrial partners
from all over Europe is coordinated
by Aston University, Birmingham, UK.
The NEWLED consortium has been
assembled to bring together highly
recognised experts from academia and
industry ensuring best material and
process development
supported by expert simulation and
perfectly adapted rigorous analytical
capabilities.
The principle objective of the NEWLED
project is the development of high
brightness white LEDs with high
colour rendering index (CRI >95) and
efficacies of more than 200 lm/W.
Along this, the team also investigates dual-colour monolithic blue-cyan LED
advanced packaging to enable
effective heat dissipation and light
management to realise lifetimes of
more than 50k hours. The devices
will have immediate applications in
automotive, industrial lighting and
displays industries. The widespread
implementation would reduce global
energy consumption by approximately
10% and reduce CO2 emissions by 3 Bn
tonnes with consequent economic and
environmental benefits.
NEWLED collaborators have played
a tremendous role in developing and
exploiting a range of challenging
and cutting-edge research directions
to advance both the physical
understanding and the key technology
underlying novel light-emitting diodes
with superior capabilities. During the
project, excellent progress has been
www.europeanenergyinnovation.eu
21
COMMUNICATION
made: Novel nanostructures and Fig. 1. (Top image) Chromaticity
devices have been designed, coordinates of a monolithic blue-cyan
LED and a phosphor-converted LED
project partners; detailed theoretical with a superior CRI of 98.6; (Bottom
models have been developed, e.g. image) CRI and CCT vs. current of the
for the optimal ways of colour mixing developed high-brightness white LED.
providing the optimal emission
wavelengths, spectral widths and The obtained results are enormously
necessary efficacies of the individual encouraging and confirm the great
monochromatic LEDs that serve as a potential of the NEWLED technology to
guide for the development of high- enable future development of highly-
efficacy white LEDs with high CRI. efficient and high-brightness white LEDs. l
Novel crystal growth approaches are
used to develop superior materials that Mr. James Clayton
are processed by best-in-class chip newled @ aston.ac.uk
processes facilitating optimal current
spreading and light extraction.
NEWLED has already delivered
significant advances and world record
performances in realisation of a new
class of LEDs with high capabilities.
To date, white LEDs with efficacy
of 200 lm/W at CRI of 90 with wall-
plug efficiency of ~60% have been
demonstrated by the NEWLED
consortium. The advantage of the use a
emitting in the 420-480 nm wavelength
range with a mixture of green and red
phosphors has also been explored to
achieve warm-white light emission with
correlated colour temperature (CCT)
of ~3300K and superior CRI of 98.6
(Fig. 1), thus allowing a reduction of the
number of phosphors used for warm-
white light emission with high CRI.
Contact details:
www.newled-fp7.eu
Prof. Edik Rafailov
e.rafailov @ aston.ac.uk