Sensing arrangement and corresponding detector device

A sensing arrangement, comprising:

• a sensing area, configured for accommodating a sensing substance selected for experimenting an optical response as a response of an external stimulus;
• a light emitter, configured for emitting a first light towards the sensing area;
• and
• a light receiver, configured for receiving a second light from the sensing area;
• a substrate having a first substrate surface and a second substrate surface, opposite the first substrate surface;
• wherein,
• the light emitter comprises a first LED, formed on the first substrate surface;
• the light receiver comprises a second LED, formed on the first substrate surface;
• and
• the sensing arrangement further comprises a trench, formed between the first LED and the second LED,
• wherein said first LED and said second LED, are formed from one single semiconductor stack.