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Nanostructured Efficient White LEDs based on short-period superlattices and quantum dots

STR Group is participating in NEWLED project

Comparative analysis of various ways for colour mixing from different light sources, aimed at finding optimal solutions for producing high-quality white light, will be performed by STR on the basis of state-of-the-art performance of visible LEDs. A special semi-quantitative optimisation model will be applied for this purpose, allowing estimations of the white-light quality in terms of colour rendering index (CRI), correlated colour temperature (CCT), luminous radiation efficacy, and overall emission efficiency of the light emitters. The optimal solutions will be compared with existing ones utilising the light conversion by phosphors.

Straightforward utilisation of hybrid LED chips, emitting light at different wavelengths, suffers from insufficiently uniform colour mixing in an LED lamp. To resolve this problem, a number of promising solutions will be examined by modelling at STR, like the use of non-absorbing particles embedded in silicone to scatter the light from different chips, dome shaping in the lamp, application of multi-dispersed scattering particles, etc.

Statistical model of density-of-state (DOS) tails in the bandgap of strained InGaN/GaN bulk materials and quantum wells induced by InGaN composition fluctuations will be developed by STR with account of the alloy non-ideality.

About NEWLED project

Start date:2012-11-01
End date:2016-10-31

Objective: NEWLED will develop high efficiency and high brightness monolithic and hybrid all-semiconductor WHITE light-emitting GaN-based diodes. Power losses due to phosphor conversion and the problem of different ageing rates of the GaN LED pump will be eliminated by the development of phosphor free structures with increased brightness (power emitted per surface per angle). NEWLED will enhance the efficiency of yellow InGaAlP/AlGaAs LEDs by bandgap engineered superlattices. Novel light extraction approaches will target advanced directionality and colour adjustment. Values of 50 to 60% overall efficiency with a conversion of greater than 200 lm/W in the exploited warm white LEDs are targeted as well as the realisation of a colour rendering index (CRI) of greater than 95. Advanced packaging will enable effective heat dissipation and light management. The devices will have immediate applications in automotive, industrial lighting and displays industries. Widespread implementation would reduce global energy consumption by approximately 10% and reduce CO2 emissions by 3Bn tonnes with consequent economic and environmental benefits.

You can follow the news on the project development at European Union web-site


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