Your deployment folder for a release Qt5 widgets application using the distributed Qt bundle should contain (minimum):
Qt Code: 
  1. Folder/
  2.     your.exe
  3.  
  4.     mylibrary.dll  // any DLLs you have built as part your project (maybe none)
  5.  
  6.     qextserialport.dll  // Any DLLs from third parties that your application depends on (I guessed names)
  7.     qcustomplot.dll
  8.     ...
  9.  
  10.     plugins/  // any plugins you have written and built for your project (maybe none)
  11.         myplugin.dll
  12.         myotherplugin.dll
  13.  
  14.     Qt5Core.dll  // Qt 5 libraries your program needs
  15.     Qt5Gui.dll
  16.     Qt5Core.dll
  17.     ...
  18.  
  19.     icudtXX.dll  // Things the Qt5 libraries depend on
  20.     icuinXX.dll
  21.     icuucXX.dll
  22.     libEGL.dll
  23.     libGLESv2.dll
  24.     d3dcompiler_XX.dll
  25.  
  26.     msvcr110.dll  // Dependencies your compiler imposes, in this case MS VC 11
  27.     msvcp110.dll
  28.  
  29.     platforms/ // Qt plugins required at run time to support platform
  30.         qwindows.dll
  31.  
  32.     imageformats/   // Other Qt plugins your program may require
  33.         qjpeg.dll 
  34.         ...
  35.     iconengines/
  36.         qsvgicon.dll
  37.     ...
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The distributed packages are ICU and ANGLE-based.