Optimization of high performance of ZnS/MgF2 ultraviolet light-emitting diodes

Guan, Huihuan; Han, Peide; Li, Yuping; Zhang, Xue; Zhang, Qi-Na; Wang, Liping; Zhang, Rui-Zhen

doi:10.1016/j.ijleo.2011.11.076

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…As film, it is produced by many processes like spray pyrolysis, sputtering, spin and dip coating [1][2][3][4]. We find zinc oxide in many applications such as ultraviolet light emitters and thin film transistors [5][6]. In order to study the influence of molarity on the ZnO layer properties, the films are prepared by low cost dip coating process.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

Benhaliliba¹,

Ocak²

2016

J. Nano- Electron. Phys.

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The physical properties of the pure and metal doped ZnO films are investigated using a low cost dip coating technique. The films have grown slowly onto a glass substrate at room temperature. Based on Xray pattern parameters are extracted such as grain size, lattice parameters. Optical measurements within the UV-Vis band give us the transmittance of films ( 80 %) and optical band gap. Using the Hall Effect measurement (HMS) in room temperature, we determine the bulk density of charge carriers, mobility and their electrical resistivity.

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Section: Introductionmentioning

confidence: 99%

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

Benhaliliba¹,

Ocak²

2016

J. Nano- Electron. Phys.

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“…Among the many 1D semiconductor nanomaterials, NRs of binary II-VI compounds, such as ZnO, ZnS, and CdS, have been widely studied. [7][8][9] The wurtzite type ZnS (E g = 3.66 eV) and CdS (E g = 2.49 eV) are important direct band-gap semiconductors, which have potential applications in ultraviolet-light-emitting diodes, electroluminescent devices, flat-panel displays, [10][11][12][13][14] etc. As typical solid-solution semiconductors, ternary Zn 1−x Cd x S compounds are important in exploration of their continuously tunable optical properties for the desired wavelength through the gradual variation of their compositions without changing the nanocrystal size, particularly for wavelengths in the range of 500 to 530 nm, which are of interest for the preparation of green LEDs as "must-have" emitters for the next-generation displays and white solid-state lightings.…”

Section: Introductionmentioning

confidence: 99%

Investigation of composition dependent structural and optical properties of the Zn_1−xCd_xS, coaxial Zn_0.99−xCd_xCu_0.01S/ZnS, Zn_0.99−xCd_xMn_0.01S nanorods generated by a one-step hydrothermal process

et al. 2014

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High-quality Zn(1-x)Cd(x)S, coaxial Zn(0.99-x)Cd(x)Cu(0.01)S/ZnS and Zn(0.99-x)Cd(x)Mn(0.01)S nanorods (NRs) were synthesized through a one-step hydrothermal method. The composition of the alloyed NRs was adjusted by controlling the Zn/Cd molar ratios. The results showed that all of the samples had a good crystallinity with the typical hexagonal wurtzite structure. The Zn/Cd molar ratios and Cu and Mn doping played an important role in affecting the final structure, morphology and optical properties of the alloyed NRs. The successive shift of the XRD and PL patterns indicated that the NRs obtained were not a mixture of ZnS and CdS, but the Zn(1-x)Cd(x)S solid solution. After doping Cu(2+) (1%) ions into the Zn(1-x)Cd(x)S NRs, the samples exhibited highly crystalline coaxial Zn(0.99-x)Cd(x)Cu(0.01)S/ZnS core-shell NRs and showed a strong green emission peak centered at 509.6 nm. After doping Mn(2+) (1%) ions into the Zn(1-x)Cd(x)S NRs, the samples exhibited a better crystal quality and showed a strong yellow-orange emission peak centered at 583 nm.

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“…Many scholars have used defect states to modulate LEDs so that photonic crystals act as color conversion layers or as fluorescent materials in LEDs, which improves the luminescent color of LEDs and improves the problem of poor monochromaticity of LEDs 45 . Also, the use of photonic crystal defect states can greatly improve the luminous efficiency of LEDs or be used to modulate the bandwidth 22,46–48 …”

Section: Fundamental Principles For Photonic Crystal Ledsmentioning

confidence: 99%

“…(2) Grating diffraction effect 21 : when the light entering the light guide mode interacts with a grating structure with a period comparable to the wavelength of the light, the light emitting cone is modulated so that more light falls within the light cone and escapes. (3) Defect states 22,23 : defect states can be divided into the Anderson localization, the Purcell effect, 24 and the beam collimation effect, 25 all of which can enhance the LEE and other optoelectronic performance of LEDs.…”

Section: Introductionmentioning

confidence: 99%

Design of photonic crystals for light‐emitting diodes

Wang,

Dong,

et al. 2023

J Am Ceram Soc.

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Photonic crystals (PC) can greatly enhance the optoelectronic performance of LEDs, due to their distinctive color and photonic band gap, etc. Therefore, many scholars have conducted extensive research based on the high light extraction efficiency, good monochromaticity, and other excellent optoelectronic properties of PC LEDs. This review discusses the main principles of photonic crystals to improve the optoelectronic performance of LEDs and summarizes 12 structural applications of photonic crystal LEDs, such as PC slabs, Bragg grating, Backside reflectors, Surface PC, Embedded PC, Dual PC, PC beads, CPC, PC thin films, LIPC, defective PC, composite architectures with other materials that boost LED optoelectronic qualities. In summary, it is found that photonic crystals can not only greatly improve the light extraction efficiency of LEDs but also improve other optoelectronic properties such as luminescent color, and directional radiation angle, and reduce the manufacturing cost of LEDs. Photonic crystal LEDs are expected to be a strong candidate for future lighting technology Finally, the prospects and challenges of PC LEDs are summarized.This article is protected by copyright. All rights reserved

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Optimization of high performance of ZnS/MgF2 ultraviolet light-emitting diodes

Cited by 6 publications

References 20 publications

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

Investigation of composition dependent structural and optical properties of the Zn_1−xCd_xS, coaxial Zn_0.99−xCd_xCu_0.01S/ZnS, Zn_0.99−xCd_xMn_0.01S nanorods generated by a one-step hydrothermal process

Design of photonic crystals for light‐emitting diodes

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Optimization of high performance of ZnS/MgF2 ultraviolet light-emitting diodes

Cited by 6 publications

References 20 publications

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

An Experimental Insight into the ZnO Thin Films Properties Prepared by Dip Coating Technique

Investigation of composition dependent structural and optical properties of the Zn1−xCdxS, coaxial Zn0.99−xCdxCu0.01S/ZnS, Zn0.99−xCdxMn0.01S nanorods generated by a one-step hydrothermal process

Design of photonic crystals for light‐emitting diodes

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Investigation of composition dependent structural and optical properties of the Zn_1−xCd_xS, coaxial Zn_0.99−xCd_xCu_0.01S/ZnS, Zn_0.99−xCd_xMn_0.01S nanorods generated by a one-step hydrothermal process