The emitting material can be a small organic molecule in a crystalline phase (matter), or a polymer.

But with proper control of heat it can be kept in the crystalline phase regardless of pressure.

The transition metals form a wide range of silicon intermetallics with at least one binary crystalline phase.

In the latter cases the amount of crystalline phase can be controlled to alter the mechanical properties of the materials.

In the crystalline phase the chain bonds are in their lowest energy state.

The main crystalline phases described hereafter are related respectively to the composition of:

Tantalum exists in two crystalline phases, alpha and beta.

The ordering of liquid crystalline phases is extensive on the molecular scale.

The crystalline phase has a lower density than the amorphous phase.

If the transition produces another crystalline phase, one set of lines will suddenly be replaced by another set.