[Ca24Al28O64]4+(4e–) is a new inorganic electride, which is air-stable even at ∼ 300 °C. Its electron field-emission properties originate from electron anions encaged in subnanometer-sized cages embedded in its crystal structure, and the emission current is controlled by Fowler–Nordheim field emission at high electric fields (see Figure). Field-emission display devices demonstrate bright light emission clearly visible under ambient light (inset).
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