How is the polarized and non polarized LED, in electrical principal, different ?
In view if semiconductor structure or another important application consideration ?

 

All LEDs are polarized.
What LED are you referring to that you think is non-polarized?

 

How is the polarized and non polarized LED, in electrical principal, different ?
In view if semiconductor structure or another important application consideration ?

LED (Light Emitting Diode) so are you asking about polarity as to anode and cathode then there is no non-polarized as was pointed out. If you are speaking about polarization of the light emitted by a light emitting diode then you may want to give this a read, So as to Anode/Cathode being + / - then all LEDs are polarized but as to the polarization of the emitted light I suggest reading the link. It's either about the emitted light or the polarity of the leads, which were you interested in?

Ron

 

Clearly the use of the word polarized is ambiguous.

Yet another answer:
There exist packaged LEDs with two die connected in parallel but with opposite polarity with respect to the two input leads so that light will be emitted regardless of the polarity of the applied voltage.

The example that first comes to mind are the bi-color LEDs(or tri-color), such as the ones with red and green die. By control of the direction of the applied current it can be made to shine red light or green light. When subject to AC it appears (Red + Green) = Yellow.

 

Polarized LED light: http://www.laserfocusworld.com/articles/print/volume-44/issue-5/world-news/light-emitting-diodes-student-develops-first-polarized-led.html

Ken

 

The led emits polarized light. Wikipedia will explain the meaning of that. The article is a bit vague as to how the led does it.