When extremely small ("Q state") semiconductor particles of CdS or Cd3As2 are treated with small amounts of alkylamines (e.g. N(Et)3) dramatic increases (up to 450%) in the quantum yield for exciton emission result. Similar results are found for colloids suspended in bulk (aqueous) solution, nonaqueous (2-propanol) solution, and reverse (AOT) micelles. This effect is interpreted as modification of midband gap states, probably associated with excess Cd2+, by N(Et)3 binding. Such states can dominate radiationless decay in Q state materials. When these states are modified, the quantum yield can approach unity (for Cd3As2).

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Dramatic increases (up to 450%) in the quantum yield for exciton emission are observed when small amounts of certain bases (e.g.

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