Security or value document with a Lumineszenzmerkmal and method of checking the authenticity of security or value document

Establishing a forgery-proof security feature a security or valuable document 100 is proposed which is formed of a document body 150th The document body 150 is made by laminating at least two interconnected polymer layers 120, 130, 140 and has at least one window area 210, 210 ', 210' ', wherein in the at least one window region 210, 210', 210 '' is at least an absorbing member 300, 300 ', 300' 'and at least one being with the at least one absorbent member 300, 300', 300 '' overlapping luminescent element 400, respectively. At least the at least one absorbent member 300, 300 ', 300' 'is formed by a thermoplastic material.