Enhanced Light Extraction from SrGa2S4:Eu2+ Film Phosphors Coated with Various Sizes of Polystyrene Nanosphere Monolayers

Ko, Ki Young; Lee, Keyong Nam; Lee, Young Kwang; Rag, Young

doi:10.1021/jp800115r

Cited by 21 publications

(18 citation statements)

References 23 publications

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“…As consistent with results in our previous research, 27 the XRD patterns indicate that the as-grown SrGa 2 S 4 :Eu 2þ TFPs annealed at 700 C coincide with the pure orthorhombic PbGa 2 Se 4 phase reported in the corresponding JCPDS cards (Fig. As consistent with results in our previous research, 27 the XRD patterns indicate that the as-grown SrGa 2 S 4 :Eu 2þ TFPs annealed at 700 C coincide with the pure orthorhombic PbGa 2 Se 4 phase reported in the corresponding JCPDS cards (Fig.…”

Section: Resultssupporting

confidence: 94%

“…For the fabrication of micro-patterned 2D SiO 2 nano-arrays, we used two methods by changing the order of the formation of the micro-and nano-scale patterns. [25][26][27] Furthermore, we demonstrate the micro-patterned emission images of SrGa 2 S 4 :Eu 2þ TFPs by sputtering TFPs on micro-patterned 2D SiO 2 PC nanoarrays. 23 The second approach was to form the micro-scale pattern first and then the nano-scale pattern.…”

mentioning

confidence: 91%

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Fabrication of Micro-Patterned 2D Nanorod and Nanohole Arrays by a Combination of Photolithography and Nanosphere Lithography

Park¹,

Moon²,

Yoon³

et al. 2011

J. Electrochem. Soc.

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This paper reports a facile fabrication technique for micro-patterned two-dimensional (2D) nanorod and nanohole arrays. This technique is based on a combination of two simple and scalable processes: photolithography for micro-patterns and nanosphere lithography (NSL) for nano-patterns. Mixed patterns, such as micro-scale line patterned 2D SiO 2 nanoarrays, can be routinely fabricated over a quartz substrate owing to the high reproducibility of this simple method. In micro-patterned 2D nanoarrays, the structural dimensions of micro-patterns can be controlled by general optimization of photolithography techniques; structural dimensions of nano-patterns can be controlled with the NSL technique. We demonstrate micro-patterned fluorescence images of SrGa 2 S 4 :Eu 2þ thin-film phosphors (TFPs) by depositing TFPs on micro-patterned 2D SiO 2 photonic crystal (PC) nanoarrays using rf-magnetron sputtering technique. It is expected that photolithography-assisted NSL will be incorporated easily in the fabrication of micro-patterned PC for the various photonic or optoelectronic devices.

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Section: Resultssupporting

confidence: 94%

mentioning

confidence: 91%

Fabrication of Micro-Patterned 2D Nanorod and Nanohole Arrays by a Combination of Photolithography and Nanosphere Lithography

Park¹,

Moon²,

Yoon³

et al. 2011

J. Electrochem. Soc.

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“…Generally, 2D photonic crystal structures and patterns are made via periodically arrayed air holes in a thin slab, ordered periodically arrayed pillars or self‐assembled monolayers of colloidal spheres . One method of exploiting 2D photonic crystals to enhance luminescence in the vertical direction is by placing a light‐emitting layer under the 2D photonic crystal (with or without contact with the 2D photonic crystals) .…”

Section: Manipulating Luminescence By 2d Photonic Crystalsmentioning

confidence: 99%

“…In addition to 2D slabs, Ko et al coated 2D photonic crystals of monolayer polystyrene (PS) nanospheres on sputtered SrGa 2 S 4 :Eu 2+ luminescent films ( Figure ). They found that the emission and excitation intensities of the sample were greatly enhanced.…”

Section: Manipulating Luminescence By 2d Photonic Crystalsmentioning

confidence: 99%

“…As the spontaneous emission of an emitter is critically affected by its local environment or density of electromagnetic states, we place special emphasis on understanding the effects associated with changes in the local density of states in photonic crystals with varied dimensions, structures and refractive indices ( Table 1 ). Although the introduction of defects into crystal structures is a viable method to shift propagating modes in photonic bands for luminescence tuning, we will not cover that aspect because achieving precise control over site‐specific defects by conventional chemical methods has not been well established.…”

Section: Introductionmentioning

confidence: 99%

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Manipulating Luminescence of Light Emitters by Photonic Crystals

et al. 2018

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dispersion by semiconductor devices based on the electron energy bandgap-the forbidden energies separating allowed energy bands. An example of photonic crystals with simple periodic arrays formed from dielectric spheres is shown in Figure 1. According to Bragg's equation, [3] the wavelength of the photons scattered from the crystal lattice can be calculated by the following formula (Equation (1)where d is the diameter of the sphere, m is the Bragg reflection order, and θ is the angle between the normal and incident light. The value of n a is defined as the weighted sum of sphere portion refractive indices and the gap portion (Equation (2)) [3] ∑ φ = n n i i a 2 2(2)where n is the refractive index of different components inside photonic crystals and φ i is the volume fraction of each i portion. For the close-packed structure, φ i of the sphere portion is 0.74. Photon propagation can be precisely controlled by designing a photonic crystal with a specific photonic bandgap. Hence, a future trend in the design of photonic crystals may lie in the modification and realization of spontaneous emission by light emitters integrated with these crystals. [4][5][6] Spontaneous emission refers to an optical process in which a quantum mechanical system in an excited state returns to a lower-energy or ground state and releases energy in the form of a photon. The quantum system could be an atom, molecule or nanocrystal. The photoluminescence (PL) produced by spontaneous emission plays a crucial role in conventional modern technologies used in daily lives, such as television screens (cathode ray tubes), plasma display panels, and fluorescence tubes.While spontaneous emission has enabled the progress of several technologies, uncontrolled spontaneous emission can limit the performance of photonic devices in many applications. One such limitation in device performance in light-emitting diodes (LEDs) occurs when an excessive number of photons generated from spontaneous emission are confined or trapped within the device. This shortcoming is also observed in laser operation when photon emission fails to couple with lasing processes, resulting in energy loss and noise in the signal output. Consequently, precise control over the propagation of spontaneous emission is critical. Due to their ability to manipulate light The modulation of luminescence is essential because unwanted spontaneousemission modes have a negative effect on the performance of luminescencebased photonic devices. Photonic crystals are promising materials for the control of light emission because of the variation in the local density of optical modes within them. They have been widely investigated for the manipulation of the emission intensity and lifetime of light emitters. Several groups have achieved greatly enhanced emission by depositing emitters on the surface of photonic crystals. Herein, the different modulating effects of photonic crystal dimensions, light-emitter positions, photonic crystal structure type, and the refractive index of photonic crystal building bl...

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Utilization of All Hydrothermally Synthesized Red, Green, Blue Nanophosphors for Fabrication of Highly Transparent Monochromatic and Full‐Color Plasma Display Devices

Song

Lee

Rag

et al. 2012

Adv Funct Materials

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Visible transparency is one of the attributes pursued in the advancement of display devices. Such a transparency can be realized in a plasma display device simply by applying Y(V,P)O4:Eu red‐, Y(V,P)O4:Tm blue‐, and LaPO4:Ce,Tb green‐emitting nanophosphors with a controlled particle size and reasonable luminescence. The nanophosphors of three primary colors are all hydrothermally synthesized and annealed at appropriate conditions. Highly transparent, uniform emissive layers are deposited by screen‐printing the nanophosphor pastes. Using respective screen‐printed nanophosphor layers of red, blue, and green, monochromatic transparent test panels of plasma display are fabricated and characterized. Ultimately, a white‐luminescing full‐color transparent panel is successfully demonstrated by line‐patterning the individual nanophosphor layers. Furthermore, for an effort to extract more photons and thus improve the brightness of the test panel, polystyrene monolayer‐based 2D photonic crystal is introduced as a scattering medium on the outer surface of the panel and its usefulness was proved.

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Enhanced Light Extraction from SrGa₂S₄:Eu²⁺ Film Phosphors Coated with Various Sizes of Polystyrene Nanosphere Monolayers

Cited by 21 publications

References 23 publications

Fabrication of Micro-Patterned 2D Nanorod and Nanohole Arrays by a Combination of Photolithography and Nanosphere Lithography

Fabrication of Micro-Patterned 2D Nanorod and Nanohole Arrays by a Combination of Photolithography and Nanosphere Lithography

Manipulating Luminescence of Light Emitters by Photonic Crystals

Utilization of All Hydrothermally Synthesized Red, Green, Blue Nanophosphors for Fabrication of Highly Transparent Monochromatic and Full‐Color Plasma Display Devices

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