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Design and Analysis of “Chess Board” Like Photonic Crystal Structure for Improved Light Extraction in GaN/InGaN LEDs

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3 Author(s)
Patra, S.K. ; Opto-electronic Devices Group, Council of Scientific and Industrial Research-Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani, India ; Adhikari, S. ; Pal, S.

In this paper, we have proposed a “Chess board” like photonic crystal (PhC) structure on top surface of {\rm p-GaN/SiO}_{2} layer in conventional LED, on top surface of n-GaN layer in vertical LED and an embedded PhC structure in n-GaN layer for achieving an improved light extraction in GaN/InGaN LEDs. The results are compared with that of the LED structures with conventional 2-D PhC structures and of the conventional LEDs. Results from these simulations show that the maximum light extraction for conventional LED having “Chess board” like structure occurs for a grating period of 0.6 \mu{\hbox {m}} with a grating-depth of 0.18 \mu{\hbox {m}} , which gives \sim 4 times enhancement compared to that of conventional LED and 1.2–1.4 times compared to that of LED with conventional 2-D PhCs. In case of a vertical LED, the maximum enhancement in light extraction occurs for the same grating-period with a depth of 0.5 \mu{\hbox {m}} , which is \sim 3.5 times compared to that of the conventional vertical LEDs. We have also simulated our proposed structure on top of {\hbox {SiO}}_{2} -on-p-GaN layer in order to avoid the etching of p-GaN layer, which shows \sim 2.2 times enhancement in comparison to that of conventional LED. For the proposed embedded PhC structure in n-GaN layer, the light extraction is enhanced by a factor of 2.8–3.5 as compared to the conventional LED.

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Display Technology, Journal of  (Volume:9 ,  Issue: 5 )