Isolation, mass production, and characterization in solution and in the solid state of the facial stereoisomer of tris(quinolin‐8‐olato)aluminum(III) (Alq3) is reported. A phase‐ transformation diagram shows how to selectively produce the two blue‐emitting polymorphs of the fac isomer (γ‐ and δ‐Alq3; see Figure) via a solid‐to‐solid reaction, opening the route to the development of blue‐light‐emitting Alq3‐based OLEDs.
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