Realizing freeform lenses using an optics 3D-printer for industrial based tailored irradiance distribution

Assefa, Bisrat G.; Saastamoinen, Toni; Pekkarinen, Markku; Nissinen, Ville; Biskop, Joris; Kuittinen, Markku; Turunen, Jari; Saarinen, Jyrki

doi:10.1364/osac.2.000690

Cited by 21 publications

(9 citation statements)

References 25 publications

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“…Currently, the attention is on scattering enhancement materials that is cost-effective and can be easily integrated into the lighting structure. Among the enhancement materials, TiO2, ZrO2 and SiO2, the metal oxide compounds, are proven as effective materials in promoting angular CCT uniformity, a results concluded from experiments [15]- [18]. The ZrO2 with 300 nm of particle size can reduce color temperature deviation by 580 K from 1000 K to 420 K in between −70° to 70° angles, a result obtained the research conducted by Chen et al [15].…”

Section: Introductionmentioning

confidence: 76%

“…Among the enhancement materials, TiO2, ZrO2 and SiO2, the metal oxide compounds, are proven as effective materials in promoting angular CCT uniformity, a results concluded from experiments [15]- [18]. The ZrO2 with 300 nm of particle size can reduce color temperature deviation by 580 K from 1000 K to 420 K in between −70° to 70° angles, a result obtained the research conducted by Chen et al [15]. Another scattering materials, TiO2, is proved as effective in limiting CCT diversion through experiments by Lee et al [18].…”

Section: Introductionmentioning

confidence: 92%

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Enhancing light scattering effect of white LEDs with ZnO nanostructures

Thi

Loan

Ngoc

2021

IJECE

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Pc-LEDs, the lighting method that blends blue LED light with yellow light from phosphor to discharge white radiation, is one of the most advance known for high lumen output. However, pc-LEDs has inferior due to angular CCT deviation, which prevent pc-LEDs from reaching better performance. As a result, this research is conducted to address the need of pc-LEDs development by introducing a configuration doped with ZnO nanoparticles. The finite-difference time-domain (FDTD) method and the phosphor layer containing ZnO were applied in the experiments. The effect of ZnO-filled on the performance of color quality pc-LEDs is confirmed through calculated results. In particular, the uniformity of scattered light is improved with the presence of ZnO. In addition, ZnO particles also minimize the deviation of color temperature and enhance the color quality. Although there is a small decline in lumen output to achieve better color temperature uniformity, however, with suitable concentrations such as 0.25% N-ZnO, 0.25% S-ZnO, and 0. 75% R-ZnO, the decline is acceptable. The research on ZnO pc-LEDs demonstrates that this affordable and simple configuration can improve lighting properties and create other directions to enhance white light

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 92%

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Thi

Loan

Ngoc

2021

IJECE

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“…Mie-scattering theory is used to study the scattering events inside remote-phosphor WLEDs and support the computation of scattering cross section Csca for spherical particles. Additionally, Lambert-Beer law is utilized to compute the transmitted light power [24], [25]:…”

Section: Resultsmentioning

confidence: 99%

Triple-layer remote phosphor structure: a selection of the higher color quality and lumen efficiency for WLEDs

Tien

2021

Bulletin EEI

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To enhance color quality of glass-based phosphor-converted white light-emitting diodes (pc-WLEDs) with multi-layer remote phosphor layer structures, two phosphors, green CdS:In and red ZnS:Te,Mn, are integrated into the glass matrix and applied to the dual-layer and triple-layer WLED packages. The attained results were examined with Mie-scattering theory and Lambert-Beer law. The dual-layer showed significant enhancement in color rendering index (CRI), in the range of approximate 80-90. Meanwhile, CRI in the triple-layer was lower and stayed around 66. In terms of color quality scale (CQS), a more overall color evaluating index, triple-layer structure helps the glass-based WLED achieve higher value than the dual-layer. The triple-layer is also beneficial to the luminous efficacy, according to the experimented results. Thus, the triple-layer structure can be used to strengthen the benefit of the glass matrix used in WLED products.

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“…In order to fabricate graphene enhanced THz metasurface, we employ a high-resolution layer-by-layer 3D printing technique [ 29 , 30 , 31 ] with 3D printer having three independent heads. Each head sends out drops of the liquid polymer LUX-Opticlear (Luxexcel, Alpharetta, GA, USA).…”

Section: Methodsmentioning

confidence: 99%

Terahertz Absorber with Graphene Enhanced Polymer Hemispheres Array

et al. 2021

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We propose an original technique for the fabrication of terahertz (THz) metasurfaces comprising a 3D printed regular array of polymer hemispheres covered with a thin conductive layer. We demonstrate that the deposition of a thin metal layer onto polymer hemispheres suppresses the THz reflectivity to almost zero, while the frequency range of such a suppression can be considerably broadened by enhancing the structure with graphene. Scaling up of the proposed technique makes it possible to tailor the electromagnetic responses of metasurfaces and allows for the fabrication of various components of THz photonics.

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Realizing freeform lenses using an optics 3D-printer for industrial based tailored irradiance distribution

Cited by 21 publications

References 25 publications

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Triple-layer remote phosphor structure: a selection of the higher color quality and lumen efficiency for WLEDs

Terahertz Absorber with Graphene Enhanced Polymer Hemispheres Array

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