Proximal nitrogen reduces the fluorescence quantum yield of nitrogen-vacancy centres in diamond oleh Marco Capelli, Lukas Lindner, Tingpeng Luo, Jan Jeske, Hiroshi Abe, Shinobu Onoda, Takeshi Ohshima, Brett Johnson, David A Simpson, Alastair Stacey, Philipp Reineck, Brant C Gibson, Andrew D Greentree