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--- intro_oled [2026/04/02 15:48] – [OLED (Organic Light Emitting Diode) screens] sophie
+++ intro_oled [2026/04/02 16:12] (current) – [physics behind OLEDs] sophie
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 # OLED (Organic Light Emitting Diode) screen
 ## physics behind OLEDs
+OLEDs are emitting light thanks to the electron-hole recombination principle.
+OLEDs are made of:
+  * an organic emissive layer in which electron and hole recombine: electrons being excited by an electrical field unexcite themselves by emitting a photon
+  * (optional: only for multilayer OLEDs) a hole transport and electron transport layer above and below the emissive layer, respectively: to improve the movment of holes and electrons towards the emissive layer
+  * (optional: only for multilayer OLEDs) a hole injection layer to improve the movement of hole from the anode towards the hole transport layer
+  * two electrodes: an anode under the hole injection layer and a cathode on top of the electron transport layer
+  * a subtrate - usually glass - under the anode
+{{:capture_d_ecran_2026-04-02_160915.png?direct&400 |}} (([Joëlle Rault-Berthelot, Cyril Poriel, Diodes électroluminescentes organiques : quatre technologies différentes, 2021](https://univ-rennes.hal.science/hal-03388539/file/Rault-Berthelot-2021-%20OLED%204%20technologies%20diff%C3%A9rentes.pdf)))
 s
 ## Types of rigidity: flexible vs. rigid OLED screens