Study on photoluminescence of GaN-based UV-LEDs with refractive index gradient polymeric nanopatterns

Park, Manshik; Yu, Guiduk; Shin, Kyusoon

doi:10.1016/j.jcrysgro.2011.01.045

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…It shows that the GRIN structure also has advantages for enhancement of luminous efficacy, compared to the nongradient and low‐refractive structure. Since the total reflection loss originates from refractive index difference between two different materials, the GRIN structure can decrease the reflection at the interface . Moreover, compared to the nongradient coating with low refractive index, the scattering loss of light also reduces.…”

Section: Resultsmentioning

confidence: 99%

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Zhuo

et al. 2018

J Am Ceram Soc

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A gradient refractive index (GRIN) structure, with a gradual increase in the refractive index from the glass substrate, was successfully obtained by multilayer screen printing for white light‐emitting diodes (w‐LEDs) packaging. Each phosphor‐in‐glass (PiG) coating consisted of B2O3–SiO2–ZnO glass matrix and yellow phosphor. The gradually increased refractive index (1.62, 1.72, and 1.82) of glass matrices were obtained from higher molecular weight of La2O3 and WO3. After sintering at 600°C, no obvious interface was observed and the phosphor particles were mixed thoroughly in the glass matrix. When the phosphor content was 50 wt%, the white‐light emission was obtained. Compared with those based on the nongradient and low‐refractive PiG coating, the luminous efficacy of w‐LEDs constructed by the PiG coating with GRIN was enhanced. It shows that the GRIN structure is beneficial to improve the luminous efficacy of w‐LEDs.

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Section: Resultsmentioning

confidence: 99%

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Zhuo

et al. 2018

J Am Ceram Soc

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“…This behavior would be extremely useful for the application of an AR film to many optical devices, such as solar cells and flat panel display units, which require high transmittance at various incidence angles. 13,31,32 Fig. 5 presents the reflectance of the N-ARS film and flat PMMA film.…”

Section: Optical Property Of Ars Filmsmentioning

confidence: 99%

Robustly nano-tailored honeycomb structure for high-throughput antireflection polymer films

et al. 2012

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Nanoparticle Stacks with Graded Refractive Indices Enhance the Omnidirectional Light Harvesting of Solar Cells and the Light Extraction of Light‐Emitting Diodes

Fang

Liu

Lee

et al. 2012

Adv Funct Materials

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In this study, nanoparticles (NPs) of various types and sizes are arranged to enhance both the omnidirectional light harvesting of solar cells and the light extraction of light emitting diodes (LEDs). A graded‐refractive‐index NP stack can minimize reflectance, not only over a broad range of wavelengths but also at different incident angles; the photocurrent of silicon‐based solar cells an also be significantly improved omnidirectionally. In addition, the optical gradient of an NP stack can also enhance the light‐extraction efficiency of LEDs, due to both the graded refractive index and the moderate surface roughness. Large particles having sizes on the same order of the wavelength of the incident light roughen the LED surfaces further and extract light from beyond the critical angle, as supported by three‐dimensional finite‐difference time‐domain simulations. Using this approach, the photoluminescence intensity can be increased by up to sevenfold. The developed technique: arranging sequences of different NPs in graded‐refractive‐index stacks, and considering their ability to scatter light due to their sizes and optical constants, may also significantly improve the performance of various optoelectronic devices.

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Study on photoluminescence of GaN-based UV-LEDs with refractive index gradient polymeric nanopatterns

Cited by 4 publications

References 22 publications

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Robustly nano-tailored honeycomb structure for high-throughput antireflection polymer films

Nanoparticle Stacks with Graded Refractive Indices Enhance the Omnidirectional Light Harvesting of Solar Cells and the Light Extraction of Light‐Emitting Diodes

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