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Bis-4-(N-carbazolyl)phenyl)phenylphosphine oxide as a BCPO molecule, were doped in PVK with certain concentrations, forming PVK:BCPO mixing light-emitting layers.  It was used as the emitting material in Near ultraviolet organic light-emitting diodes (NUV-OLEDs) .^[1]

[1] YAN S, QIN M, SHEN C, et al. Efficient near ultraviolet organic light-emitting diode based on PVK material doped with BCPO molecules[J]. Synthetic Metals, 2020, 263: 116368. DOI:10.1016/j.synthmet.2020.116368.