HIP to be Square: Simplifying Nitridophosphate Synthesis in a Hot Isostatic Press

Abstract

(Oxo)Nitridophosphates have recently been identified as a promising compound class for application in the field of solid‐state lighting. Especially, the latest medium‐pressure syntheses under ammonothermal conditions draw attention of the semiconductor and lighting industry on nitridophosphates. In this contribution, we introduce hot isostatic presses as a new type of medium‐pressure synthetic tool, further simplifying nitridophosphate synthesis. In a second step, phosphorus nitride was replaced as starting material by red phosphorus, enabling the synthesis of Ca2PN3 as model compound, starting only from readily available compounds. Moreover, first luminescence investigations on Eu2+‐doped samples reveal Ca2PN3:Eu2+ as a promising broad‐band red‐emitter (λem=650 nm; fwhm=1972 cm−1). Besides simple handling, the presented synthetic method offers access to large sample volumes, and the underlying reaction conditions facilitate single‐crystal growth, required for excellent optical properties.

Synthesis of Nitride Zeolites in a Hot Isostatic Press

“…HIPs do not only provide large sample quantities, but also shorten reaction times and facilitate crystal growth under comparatively gentle reaction conditions. Moreover, we have demonstrated that red phosphorus can serve as a starting material in HIPs as well, simplifying nitridophosphate syntheses even more [28] …”

Festkörperchemie

“…Die Gruppe von Schnick präsentierte ein neues, schnelles und einfaches Herstellungsverfahren für Nitridophosphate (Abbildung 3). 18) Das Verfahren basiert auf Mitteldruck-heißisostatischem Pressen (HIP). Beispielsweise entstanden damit erstmals Ca 2 PN 3 -Einkristalle.…”

Post‐Synthetic Modification: Systematic Study on a Simple Access to Nitridophosphates

“…Already initially used ambient and medium‐pressure (MP) methods ((pressure‐)ampoules, autoclaves) have enabled the preparation of various (oxo/imido)nitridophosphates, phosphorus nitrides, and related compounds [1, 3–10] . The variety of nitridophosphates, which are accessible under MP conditions, has recently been increased by hot isostatic pressing and systematic investigations using high‐temperature ammonothermal methods [2, 11–14] . Despite these advances in MP synthesis, high‐pressure high‐temperature (HP/HT) conditions are still most commonly used for nitridophosphate synthesis [1] .…”