The effect of nanometre-scale V-pits on electronic and optical properties and efficiency droop of GaN-based green light-emitting diodes

The optical properties of InGaN/GaN green light-emitting diodes (LEDs) with an undoped graded short-period superlattice (GSL) and a Si-doped GSL (SiGSL) were investigated using photoluminescence (PL) and time-resolved PL spectroscopies. For comparison, an InGaN/GaN conventional LED (CLED) without the GSL structure was also grown. The SiGSL sample showed the strongest PL intensity and the largest PL peak energy because of band-filling effect and weakened quantum- confined stark effect (QCSE). PL decay time of SiGSL sample at 10 K was shorter than those of the CLED and GSL samples. This finding was attributed to the oscillator strength enhancement by the reduced QCSE due to the Coulomb screening by Si donors. In addition, the SiGSL sample exhibited the longest decay time at 300 K, which was ascribed to the reduced defect and dislocation density. These results indicate that insertion of the Si-doped GSL structure is an effective strategy for improving the optical properties in InGaN/GaN green LEDs.

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Temperature-dependent efficiency droop behaviors of GaN-based green light-emitting diodes

Chinese Physics B ◽

10.1088/1674-1056/22/4/047805 ◽

2013 ◽

Vol 22 (4) ◽

pp. 047805 ◽

Cited By ~ 4

Author(s):

Rong Jiang ◽

Hai Lu ◽

Dun-Jun Chen ◽

Fang-Fang Ren ◽

Da-Wei Yan ◽

...

Keyword(s):

Light Emitting Diodes ◽

Green Light ◽

Efficiency Droop ◽

Temperature Dependent ◽

Light Emitting

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Electronic and optical properties of staggered InGaN/InGaN quantum-well light-emitting diodes

physica status solidi (a) ◽

10.1002/pssa.200925020 ◽

2009 ◽

Vol 206 (11) ◽

pp. 2637-2640 ◽

Cited By ~ 20

Author(s):

Seoung-Hwan Park ◽

Doyeol Ahn ◽

Bun-Hei Koo ◽

Jong-Wook Kim

Keyword(s):

Optical Properties ◽

Quantum Well ◽

Light Emitting Diodes ◽

Light Emitting ◽

Electronic And Optical Properties

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Optical properties of green light-emitting diodes grown on r-plane sapphire substrates

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology ◽

10.1109/iqec-cleo.2011.6193816 ◽

2011 ◽

Author(s):

Yong Gon Seo ◽

Kwang Hyeon Baik ◽

Hoo-Young Song ◽

Ji-Su Son ◽

Jihoon Kim ◽

...

Keyword(s):

Optical Properties ◽

Light Emitting Diodes ◽

Green Light ◽

Light Emitting ◽

Sapphire Substrates

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InGaN/GaN self-organized quantum dot green light emitting diodes with reduced efficiency droop

Applied Physics Letters ◽

10.1063/1.3460921 ◽

2010 ◽

Vol 97 (1) ◽

pp. 011103 ◽

Cited By ~ 89

Author(s):

Meng Zhang ◽

Pallab Bhattacharya ◽

Wei Guo

Keyword(s):

Quantum Dot ◽

Light Emitting Diodes ◽

Green Light ◽

Efficiency Droop ◽

Light Emitting ◽

Self Organized

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Using Pre-TMIn Treatment to Improve the Optical Properties of Green Light Emitting Diodes

International Journal of Photoenergy ◽

10.1155/2014/952567 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6

Author(s):

Bing Xu ◽

Hai Tao Dai ◽

Shu Guo Wang ◽

Fu-Chuan Chu ◽

Chou-Hsiung Huang ◽

...

Keyword(s):

Optical Properties ◽

Quantum Wells ◽

Radiative Decay ◽

Light Emitting Diodes ◽

Light Output ◽

Green Light ◽

Time Resolved ◽

Light Emitting ◽

Transmission Electron ◽

Green Led

We investigated the effects of pre-TMIn treatment on the optical properties of green light emitting diodes (LEDs). Although pre-TMIn treatment did not affect the epitaxial structure of quantum wells, it significantly improved the quality of the surface morphology relative to that of the untreated sample. Indium cluster can be seen by high-resolution transmission electron microscopy (HR-TEM), which is the explanation for the red-shift of photoluminescence (PL). Time-resolved photoluminescence measurements indicated that the sample prepared with pre-TMIn treatment had a shorter radiative decay time. As a result, the light output power of the treated green LED was higher than that of the conventional untreated one. Thus, pre-TMIn treatment appears to be a simple and efficient means of improving the performance of green LEDs.

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