[1] Delft Univ Technol, Delft Inst Microsyst & Nanoelect, NL-2628 CD Delft, Netherlands
[2] Changzhou Inst Technol Res Solid State Lighting, Changzhou 213161, Peoples R China
[3] Chongqing Univ, Educ Minist China, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China
[4] Chongqing Univ, Coll Optoelect Engn, Chongqing 400044, Peoples R China
[5] Lamar Univ, Dept Mech Engn, Beaumont, TX 77710 USA