[FORM 10-Q x For the quarterly period ended May 31, 2012 or o For the transition period from to SemiLEDs Corporation Delaware 20-2735523 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification Number) 3F, No. 11 Ke Jung Rd., Chu-Nan Site, Hsinchu Science Park, Chu-Nan 350, Miao-Li County, Taiwan, R.O.C. 350 (Zip Code) +886-37-586788 x No o x] [1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER OF THE SARBANES-OXLEY ACT OF 2002 I, Trung Tri Doan, certify that: 1. 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made,] [CERTIFICATION OF CHIEF FINANCIAL OFFICER OF THE SARBANES-OXLEY ACT OF 2002 I, David Young, certify that: 1. 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading] [CERTIFICATION SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (1) (2) Dated: July 13, 2012 EX-32.1 4 a12-14313_1ex32d1.htm EX-32.1] [CERTIFICATION SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (1) (2) Dated: July 13, 2012 EX-32.2 5 a12-14313_1ex32d2.htm EX-32.2]

[FORM 10-Q x For the quarterly period ended February 29, 2012 or o For the transition period from to SemiLEDs Corporation Delaware 20-2735523 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification Number) 3F, No. 11 Ke Jung Rd., Chu-Nan Site, Hsinchu Science Park, Chu-Nan 350, Miao-Li County, Taiwan, R.O.C. 350 (Zip Code) +886-37-586788 x No o x] [1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER OF THE SARBANES-OXLEY ACT OF 2002 I, Trung Tri Doan, certify that: 1. 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made,] [CERTIFICATION OF CHIEF FINANCIAL OFFICER OF THE SARBANES-OXLEY ACT OF 2002 I, David Young, certify that: 1. 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading] [CERTIFICATION SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (1) (2) Dated: April 13, 2012 EX-32.1 4 a12-5474_1ex32d1.htm EX-32.1] [CERTIFICATION SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (1) (2) Dated: April 13, 2012 EX-32.2 5 a12-5474_1ex32d2.htm EX-32.2]