Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap”

Chunyu Zhao; Chak Wah Tang; Billy Lai; Guanghui Cheng; Jiannong Wang; Kei May Lau

doi:doi:10.1364/PRJ.380158

Photonics Research, 2020, 8 (5): 05000750, Published Online: Apr. 26, 2020

Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap” Download： 793次

Chunyu Zhao ^1,2Chak Wah Tang ¹Billy Lai ¹Guanghui Cheng ²Jiannong Wang ²Kei May Lau ^1,*

Author Affiliations

¹ Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

² Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Figures & Tables

Fig. 1. (a)–(c) Schematic structures of the InGaN QDs without capping, capped InGaN QDs, and InGaN QD LEDs.

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Fig. 2. (a) X-ray reflectivity of QDs with and without capping; (b) omega-2theta scan curve of the QD LEDs.

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Fig. 3. (a) AFM image of InGaN QDs; (b) height distribution of InGaN QDs extracted from the AFM image; (c) AFM image of QD LEDs; (d) TRPL measurements of capped QDs.

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Fig. 4. (a) Cross-sectional TEM image of InGaN QDs sample with GaN capping layer; (b) high-magnification TEM image of the space between two neighboring QDs; (c) enlarged view of an InGaN QD; (d) STEM image of the interface between the InGaN QDs and GaN.

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Fig. 5. TDPL spectra of (a) QD with capping and (b) QD LED; (c) PL peak energy; and (d) PL FWHM of InGaN QD with capping and QD LED.

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Fig. 6. (a) Forward voltage versus injection current density; (b) LOP versus injection current density; (c) electroluminescence spectra of QD LED; (d) EQE as a function of current density.

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Chunyu Zhao, Chak Wah Tang, Billy Lai, Guanghui Cheng, Jiannong Wang, Kei May Lau. Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap”[J]. Photonics Research, 2020, 8(5): 05000750.

Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap” Download： 793次

Fig. 1. (a)–(c) Schematic structures of the InGaN QDs without capping, capped InGaN QDs, and InGaN QD LEDs.

Fig. 2. (a) X-ray reflectivity of QDs with and without capping; (b) omega-2theta scan curve of the QD LEDs.

Fig. 3. (a) AFM image of InGaN QDs; (b) height distribution of InGaN QDs extracted from the AFM image; (c) AFM image of QD LEDs; (d) TRPL measurements of capped QDs.

Fig. 4. (a) Cross-sectional TEM image of InGaN QDs sample with GaN capping layer; (b) high-magnification TEM image of the space between two neighboring QDs; (c) enlarged view of an InGaN QD; (d) STEM image of the interface between the InGaN QDs and GaN.

Fig. 5. TDPL spectra of (a) QD with capping and (b) QD LED; (c) PL peak energy; and (d) PL FWHM of InGaN QD with capping and QD LED.

Fig. 6. (a) Forward voltage versus injection current density; (b) LOP versus injection current density; (c) electroluminescence spectra of QD LED; (d) EQE as a function of current density.

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Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap” Download： 793次

Fig. 1. (a)–(c) Schematic structures of the InGaN QDs without capping, capped InGaN QDs, and InGaN QD LEDs.

Fig. 2. (a) X-ray reflectivity of QDs with and without capping; (b) omega-2theta scan curve of the QD LEDs.

Fig. 3. (a) AFM image of InGaN QDs; (b) height distribution of InGaN QDs extracted from the AFM image; (c) AFM image of QD LEDs; (d) TRPL measurements of capped QDs.

Fig. 4. (a) Cross-sectional TEM image of InGaN QDs sample with GaN capping layer; (b) high-magnification TEM image of the space between two neighboring QDs; (c) enlarged view of an InGaN QD; (d) STEM image of the interface between the InGaN QDs and GaN.

Fig. 5. TDPL spectra of (a) QD with capping and (b) QD LED; (c) PL peak energy; and (d) PL FWHM of InGaN QD with capping and QD LED.

Fig. 6. (a) Forward voltage versus injection current density; (b) LOP versus injection current density; (c) electroluminescence spectra of QD LED; (d) EQE as a function of current density.

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