Convertor for X-ray radiography and its manufacturing method and an X-ray detector

An X-ray detector comprising:

• a convertor including:
• a scintillator having an input surface facing an X-ray source and an opposite output surface facing a sensor array, the scintillator configured to convert X-ray radiation from the X-ray source into visible light having a particular frequency;
• and
• photonic crystals covering the input surface of the scintillator facing the X-ray source;
• wherein said photonic crystals have a two-dimensional or three-dimensional spatial structure;
• wherein said photonic crystals comprise a first material forming the crystal lattices defining cavities in periodic arrangement and a second material that fills the cavities defined by the crystal lattices;
• wherein said first material and second material have a two-dimensional or three-dimensional spatial structure and a refractive index difference between the first material and the second material meets a predefined difference value condition;
• wherein the positions of the cavities filled with the second material are selected to provide energy band gaps that match the particular frequency of visible light generated by the scintillator, such that the photonic crystals are configured to reflect the visible light generated by the scintillator;
• and
• wherein the positions of the cavities filled with the second material are further selected to define a reflecting direction of the visible light generated by the scintillator that is perpendicular to the input surface of the scintillator;
• an imaging apparatus configured for taking images utilizing visible light emanating from said convertor.

A method for producing a convertor for X-ray radiography, comprising:

• coating a surface of a scintillator, which scintillator is configured to convert X-ray radiation into visible light having a particular frequency, with photonic crystals having a two-dimensional or three-dimensional spatial structure;
• wherein said photonic crystals comprise a first material forming the crystal lattices defining cavities in periodic arrangement and a second material that fills the cavities defined by the crystal lattices;
• wherein said first material and second material have a two-dimensional or three-dimensional spatial structure and a refractive index difference between the first material and the second material meets a predefined difference value condition;
• wherein the positions of the cavities filled with the second material are selected to provide energy band gaps that match the particular frequency of visible light generated by the scintillator, such that the photonic crystals are configured to reflect the visible light generated by the scintillator;
• and
• wherein the positions of the cavities filled with the second material are further selected to define a reflecting direction of the visible light generated by the scintillator that is perpendicular to the surface of the scintillator covered by the photonic crystals.