Analysis of Package Factors Affecting the Light Output Efficiency of Quantum Dots-Based Micro-LEDs

The effect of ZnO nanostructures on the light output power of 375 nm near-ultraviolet light-emitting diodes (NUV-LEDs) was investigated by comparing one-dimensional (1D) nanorods (NR-ZnO) with two-dimensional (2D) nanosheets (NS-ZnO). ZnO nanostructures were grown on a planar indium tin oxide (ITO) by solution based method at low temperature of 90°C without degradation of the forward voltage. At an injection current of 100 mA, the light output efficiency of NUV-LED with NR-ZnO was enhanced by around 30% compared to the conventional NUV-LEDs without ZnO nanostructures. This improvement is due to the formation of a surface texturing, resulting in a larger escape cone and a multiple scattering for the photons in the NUV-LED, whereas the light output efficiency of NUV-LED with NS-ZnO was lower than that of the conventional NUV-LEDs due to the internal reflection and light absorption in the defective sites of NS-ZnO.

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Study on Light Intensity Enhancement of ZnO/ITO/P-GaN Light-Emitting Diodes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.4084 ◽

2011 ◽

Vol 130-134 ◽

pp. 4084-4087

Author(s):

Hsing Cheng Chang ◽

Ya Hui Chen ◽

San Shan Hung ◽

Chi Chih Lai ◽

Chein Chuan Hung ◽

...

Keyword(s):

Light Intensity ◽

Indium Tin Oxide ◽

Light Emitting Diodes ◽

Zno Nanorods ◽

Light Output ◽

Surface Roughening ◽

Light Emitting ◽

Intensity Enhancement ◽

Great Performance ◽

Output Efficiency

Light intensity enhancement of GaN-based blue light-emitting diodes (LEDs) is performed using different surface roughening technologies. Three roughening technologies are applied that contain surface roughening of p-GaN, textured indium tin oxide (ITO) on roughened p-GaN, and growing ZnO nanorods on textured ITO/p-GaN. A roughened p-GaN surface was grown on the c-plane sapphire substrate at temperature 800 °C. The morphologies of the textured LEDs with roughness in the range from 9.67 nm to 51.13 nm were observed. The light output efficiency of LED with roughened ITO layer is increased up to 73.8 %. Different dimensions of LEDs can be driven by constant injection current 20 mA without increasing threshold voltage, and larger size of ZnO/ITO/p-GaN LED shows higher luminance intensity. The LEDs with ZnO nanorods on roughened ITO/GaN have shown great performance to enhance the power conversion efficiency.

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Effect of the light output efficiency of charged particles on an unfolded neutron spectrum by an NE213 organic scintillator

Nuclear Instruments and Methods ◽

10.1016/0029-554x(70)90194-1 ◽

1978 ◽

Vol 148 (2) ◽

pp. 395-397 ◽

Cited By ~ 1

Author(s):

Nobuo Sasamoto ◽

Shun-Ichi Tanaka

Keyword(s):

Neutron Spectrum ◽

Charged Particles ◽

Light Output ◽

Organic Scintillator ◽

Output Efficiency

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Light output and fluorescence efficiency of polymer layers containing colloidal semiconductor phosphors based on CdSe/CdS/ZnS quantum dots

Optics and Spectroscopy ◽

10.1134/s0030400x15080172 ◽

2015 ◽

Vol 119 (2) ◽

pp. 327-331 ◽

Cited By ~ 3

Author(s):

S. A. Pavlov ◽

V. V. Krikushenko ◽

E. M. Antipov ◽

N. B. Voronets ◽

E. Yu. Maksimova ◽

...

Keyword(s):

Quantum Dots ◽

Light Output ◽

Polymer Layers ◽

Fluorescence Efficiency ◽

Colloidal Semiconductor

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Research on Rural Finance Efficiency and its Determinants in China Based on 2001 Counties' Data

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.472.965 ◽

2014 ◽

Vol 472 ◽

pp. 965-970

Author(s):

Hong Mei Wen ◽

Jing Chang ◽

Jing Xue

Keyword(s):

External Environment ◽

County Level ◽

Input Output ◽

Rural Finance ◽

Financial Efficiency ◽

Factors Affecting ◽

Output Efficiency ◽

Dea Method ◽

Efficiency Data

This paper uses DEA method to analyze the rural financial efficiency by collecting 2001 county-level cities and counties input-output efficiency data of rural finance, and further analyzes the factors affecting the efficiency of rural finance. It finds out that the overall level of rural financial efficiency is low, large amount of input redundancies exist in the rural finance, and the rural financial efficiency is impacted by external environment significantly.

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