Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 106, Issue 8, Pages 4752-4769Publisher
WILEY
DOI: 10.1111/jace.19122
Keywords
complex periodic structure; doping; GaN-based LEDs; light extraction efficiency; photonic crystals
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A method to synergistically control the light extraction efficiency (LEE) of GaN-based LEDs by combining complex-period photonic crystals (PhCs) with M (M = Al, In) material doping is proposed. By doping M, the LED emission wavelength range can be regulated to achieve dual-band emission. Furthermore, a triangular complex-period photonic structure is introduced to establish stacked or etched PhCs models. The optimal LEEs achieved are 19.08% and 13.96% for blue light and ultraviolet, respectively, which are larger than that of traditional flat-panel LED (4%).
The light extraction efficiency (LEE) of GaN-based light-emitting diodes (LEDs) was limited by intense total internal reflection and the photothermal effect. In order to solve this problem, a method to synergistically control the LEE of GaN-based LEDs by combining the complex-period photonic crystals (PhCs) with M (M = Al, In) material doping is proposed. The forbidden band width of two-dimensional (2D) PhC array, three-dimensional (3D) LED model, M doping, and electromagnetic field distribution are investigated respectively. By doping the M, the LED emission wavelength range is regulated to achieve the dual-band emission. Furthermore, a triangular complex-period photonic structure is introduced to establish stacked or etched PhCs models. By combining the plane wave expansion and finite difference time domain algorithm, the structural parameters of PhCs and M concentration dependent LEE are investigated, and the electromagnetic field distribution is explored also. The results show that the optimal LEEs can be achieved are 19.08% and 13.96% for blue light and ultraviolet, respectively, which are larger than that of traditional flat-panel LED (4%). This work provides theoretical results and technical support for the design of LEDs with high luminous efficiency.
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