Enhancement of light-emitting efficiency using combined plasmonic Ag grating and dielectric grating

Gou, Yuchun; Xuan, Yimin; Han, Yuge; Li, Qiang

doi:10.1016/j.jlumin.2011.06.010

Cited by 10 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be shown from the figure that because of the introduction of the micro-structured metallic grating, the light extraction efficiency has been effectively improved at most wavelengths, regardless of whether the radiation source is TM or TE polarized. The mechanisms of this improvement are attributed to two sources [11]: the scattering function of the microstructured metallic grating and the excitation of SPs at the interface between the metal and the surrounding media. The enhancement trends corresponding to the scattering function are the same for all of the metals.…”

Section: Resultsmentioning

confidence: 99%

The application of the microstructured metallic grating to light emission extraction

Gou

Xuan

2013

Chin. Sci. Bull.

Self Cite

View full text Add to dashboard Cite

Microstructured metallic gratings can be used to enhance the light emission efficiency of LEDs, and the spectral radiation properties of the LEDs vary with the different metallic materials used, leading to variation of the light emission enhancement at the same wavelength for different metallic grating materials. In this paper, the finite difference time domain (FDTD) method has been used to investigate the light emission extraction enhancement of LEDs in which gratings with different metallic materials have been applied. Through analysis of the permittivity of the metals and the quality factors of the surface plasmons (SPs), we concluded that the larger the plasma frequency obtained for the metallic interband transition, then the more suitable the metals are for light emission extraction of photons with relatively short wavelengths. This is because of the abundance of free electrons in the metals with large plasma frequencies. We also found that the wavelength-dependent trends of the extraction enhancement resulting from the scattering mechanism for different metallic materials are similar to each other. For SP-induced enhancement, either the enhancement peak position or the peak value changes significantly with the different metals.

show abstract

Section: Resultsmentioning

confidence: 99%

The application of the microstructured metallic grating to light emission extraction

Gou

Xuan

2013

Chin. Sci. Bull.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, increasing approaches have been proposed to improve the light extraction efficiency (LEE). [1][2][3][4][5][6][7][8][9][10][11][12][13][14] These approaches can be divided into two categories depending on whether the utilization of these methods results in change of spontaneous emission. 1,7 Enhancement of light emitting based on surface plasmons (SPs) belongs to the category of modification of spontaneous emission.…”

Section: Introductionmentioning

confidence: 99%

“…Its fundamental physical mechanism is the coupling of guided photons to the propagation wave through the excitation of SPs. 1,14 SPs are electromagnetic (EM) excitations propagating at the interface between a dielectric and a conductor, evanescently confined in the perpendicular direction. These EM surface waves arise via the coupling of the EM fields to oscillations of the conductor's electron plasmon.…”

Section: Introductionmentioning

confidence: 99%

“…To enhance the performance of the surface-plasmon-based light emitting diodes (SP-LEDs), therefore, the metallic gratings are commonly adopted. 1,[9][10][11][12][13][14] Although the metallic structures can extract the guided photons from the active region of LED chip to enhance the LEE, the inherent absorption of metal will discount the extraction. Especially in the visible wavelength band, the metallic absorption is very strong.…”

Section: Introductionmentioning

confidence: 99%

“…For the stimulated SPs at the interface of metal and surrounding media, the SPs can help to enhance the guided photon extraction by the micro-structures, and it can also be benefit to the absorption of photons by the metallic materials if the SPs wave cannot be coupled to the propagation wave. 14 Thus, the metallic absorption in the SP-LEDs is an important aspect, needed to be investigated intensively. In the previous researches, there are few literatures related to the discussion of this problem.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Role of metallic absorption on enhancing the light emitting efficiency by plasmonic gratings

Gou

Xuan

2013

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Due to the adoption of the metallic materials in the surface-plasmon-based light emitting diodes (SP-LEDs), strong absorption of the metal can result in the dissipation of the most photons in the form of thermal energy. In order to investigate the role of the metallic absorption in the SP-LEDs, by means of a series of computational examples of our proposed structure, the effects of several features on the absorptivity of the metal and the light extraction efficiency (LEE) of the chips have been analyzed in detail. The results indicate that the chips with combined metallic and dielectric gratings can exhibit relatively the highest LEE, whereas the absorption of the metal in the chips is very strong, and the absorptivity is several times of LEE. It is concluded that to reduce the absorption and keep high light extraction, proper structure in which the odd mode of surface plasmons can be stimulated at the desired wavelength should be used. In addition, the hexagonal gratings show relatively larger light extraction enhancement and stronger absorption than the rectangular ones. V C 2013 AIP Publishing LLC. [http://dx.

show abstract

Thermal rectification based on thermochromic materials

Huang

Zheng

et al. 2013

International Journal of Heat and Mass Transfer

101

View full text Add to dashboard Cite

Enhancement of light-emitting efficiency using combined plasmonic Ag grating and dielectric grating

Cited by 10 publications

References 20 publications

The application of the microstructured metallic grating to light emission extraction

The application of the microstructured metallic grating to light emission extraction

Role of metallic absorption on enhancing the light emitting efficiency by plasmonic gratings

Thermal rectification based on thermochromic materials

Contact Info

Product

Resources

About