Antireflective sub-wavelength structures for improvement of the extraction efficiency and color rendering index of monolithic white light-emitting diode

Ou, Yiyu; Corell, Dennis Dan; Dam-Hansen, Carsten; Petersen, Paul Michael; Ou, Haiyan

doi:10.1364/oe.19.00a166

Cited by 33 publications

(30 citation statements)

References 22 publications

(22 reference statements)

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“…The donor-acceptorpair (DAP) band luminescences from the nitrogen (N)-boron (B) doped 6H-SiC present a warmwhite color. Combined with the DAP luminescences from the nitrogen-aluminium doped 6H-SiC, pure white light with CRI larger than 90 could be produced [8,9]. Furthermore, SiC is a well-established substrate material for nitride growth and has an excellent thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Broadband and omnidirectional light harvesting enhancement of fluorescent SiC

Ou¹,

Jokubavičius²,

Hens³

et al. 2012

Opt. Express

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Abstract:In the present work, antireflective sub-wavelength structures have been fabricated on fluorescent 6H-SiC to enhance the white light extraction efficiency by using the reactive-ion etching method. Broadband and omnidirectional antireflection characteristics show that 6H-SiC with antireflective sub-wavelength structures suppress the average surface reflection significantly from 20.5 % to 1.01 % over a wide spectral range of 390-784 nm. The luminescence intensity of the fluorescent 6H-SiC could be enhanced in the whole emission angle range. It maintains an enhancement larger than 91 % up to the incident angle of 70 degrees, while the largest enhancement of 115.4 % could be obtained at 16 degrees. The antireflective sub-wavelength structures on fluorescent 6H-SiC could also preserve the luminescence spectral profile at a large emission angle by eliminating the Fabry-Pérot microcavity interference effect.

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Section: Introductionmentioning

confidence: 99%

Broadband and omnidirectional light harvesting enhancement of fluorescent SiC

Ou¹,

Jokubavičius²,

Hens³

et al. 2012

Opt. Express

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“…From the previous work [11], it was found that structure height is the crucial factor to affect the antireflection ability for cone-shaped ARS. It is found that at least 400 nm high structures are usually required to achieve fairly good antireflection performance.…”

mentioning

confidence: 99%

“…The donor-acceptor pair (DAP) band luminescence from nitrogen (N)-boron (B) doped 6H-SiC presents a warm, white color. Combined with the DAP luminescences from the nitrogen-aluminium doped 6H-SiC, pure white light with CRI larger than 90 could be produced [10,11]. Furthermore, SiC is a well-established substrate material for nitride growth and has excellent thermal conductivity.…”

mentioning

confidence: 99%

Omnidirectional luminescence enhancement of fluorescent SiC via pseudoperiodic antireflective subwavelength structures

Jokubavičius

Yakimova

et al. 2012

Opt. Lett.

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“…When the structure size was reduced to the near-wavelength scales 1 λ and 2 λ, for both the transmitted and reflected fields, the diffraction grating effect became dominant and therefore the light scattering could no longer be described by the refraction process. If we further refined the structure size to the subwavelength scale (i.e., 0.2 λ), the wide-angle antireflection, also called transparent enhancement, effect was observed [25]. From the preceding conclusion, we can identify the differences in the scattering caused by various scales of the microstructures.…”

Section: Resultsmentioning

confidence: 80%

Scale-Dependent Light Scattering Analysis of Textured Structures on LED Light Extraction Enhancement Using Hybrid Full-Wave Finite-Difference Time-Domain and Ray-Tracing Methods

Lee

Chou

2017

Energies

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A multiscale model that enables quantitative understanding and prediction of the size effect on the scattering properties of micro-and nanostructures is crucial for the design of light-emitting diode (LED) surface textures optimized for high light extraction efficiency (LEE). In this paper, a hybrid process for combining full-wave finite-difference time-domain simulation and a ray-tracing technique based on a bidirectional scattering distribution function model is proposed. We apply this method to study the influence of different pattern sizes of a patterned sapphire substrate on GaN-based LED light extraction from the micro-scale to the nano-scale. The results show that near-wavelength-scale patterns with strong diffraction are not expected to enhance the LEE. By contrast, micro-scale patterns with optical diffusion behavior have the highest LEE at a specific aspect ratio, and subwavelength-scale patterns that have antireflection properties show a marked enhancement of the LEE for a wide range of aspect ratios.

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Antireflective sub-wavelength structures for improvement of the extraction efficiency and color rendering index of monolithic white light-emitting diode

Cited by 33 publications

References 22 publications

Broadband and omnidirectional light harvesting enhancement of fluorescent SiC

Broadband and omnidirectional light harvesting enhancement of fluorescent SiC

Omnidirectional luminescence enhancement of fluorescent SiC via pseudoperiodic antireflective subwavelength structures

Scale-Dependent Light Scattering Analysis of Textured Structures on LED Light Extraction Enhancement Using Hybrid Full-Wave Finite-Difference Time-Domain and Ray-Tracing Methods

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