{"id":312034,"date":"2023-10-18T11:22:40","date_gmt":"2023-10-18T11:22:40","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=312034"},"modified":"2023-10-18T11:22:40","modified_gmt":"2023-10-18T11:22:40","slug":"inconsistency-between-2d-fdtd-and-stack-on-oled2d-examples","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inconsistency-between-2d-fdtd-and-stack-on-oled2d-examples\/","title":{"rendered":"Inconsistency between 2D-FDTD and STACK on \u201cOLED(2D)\u201d examples"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I&#8217;m doing simulations on light out-coupling efficiencies of planar OLEDs based on the &#8220;OLED(2D)&#8221; example downloaded from the gallary. Since this is a simple structure, I presume the results from FDTD and STACK should be similar. However, I found the results from the 2D-FDTD model in the &#8220;OLED(2D)&#8221; are strickly different from those from the STACK based on the same structures and materials.<\/p>\n<p>In specific, according to 2D-FDTD simulation (left), the maximum out-coupling efficiency is ~30% at ~480 nm (also shown in <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042225934-OLED-2D-\">OLED (2D) &ndash; Ansys Optics<\/a>). Using STACK (<a href=\"https:\/\/drive.google.com\/file\/d\/1SvlcFZSD6OuW3q0MD0ZGKDEQgaN5pUBq\/view?usp=sharing\" target=\"_blank\" rel=\"noopener\">Customized script<\/a>), the maximum value is ~15%. From my understanding, the STACK results are most reliable in this planar simple structure. The dramatic differences of the two methods are not likely from the mesh errors in FDTD, and I suspect that there are errors or inappropriate settings in the 2D-FDTD model in &#8220;OLED(2D)&#8221;.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/18-10-2023-1697628010-mceclip0.png\"><\/p>\n<p>I further performed 3D-FDTD on the same OLED structure and the results are consistent with the STACK results. Therefore, the errors seem to be originated from when incorporating 3D dipoles into the 2D-FDTD simulation.<\/p>\n<p>I would truly appreciate it if you could help me identify the exact issue in the &#8220;OLED(2D)&#8221; example, and on how to correct the 2D-FDTD simulations on this device.<\/p>\n<p>Yunzhou<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-312034","topic","type-topic","status-closed","hentry","topic-tag-2d-simulation-1","topic-tag-microLED-1","topic-tag-stackpurcellLumericalFDTD-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["96.7.218.215"],"_bbp_subscription":["295799","2592"],"_btv_view_count":["539"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["312034"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","295799"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["312247"],"_bbp_last_active_id":["312247"],"_bbp_last_active_time":["2023-10-19 08:47:41"]},"test":"yd359cam-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/312034","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/312034\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=312034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}