Identification of Nitrogen Defects in Diamond with Photoluminescence Excited in the 160–240 nm Region

Abstract

Photoluminescence (PL) spectra of natural diamond powders of type IaAB at 300 and 13 K were excited with synchrotron radiation in the wavelength range of 150-260 nm. The spectral features observed in the excitation spectra at 13 K show four vibrational progressions related to nitrogen defects in diamond: A, B, B', and N3. Progression A has a spacing of 1258 ± 40 cm(-1), associated with the N2 (or A) center; progression B has a spacing of 1181 ± 40 cm(-1) and progression B' has a spacing of 744 ± 40 cm(-1) related to the N4 (or B) center; and progression N3 has a spacing of 1417 ± 40 cm(-1) associated with the N3 center. The PL of these defects comprise continuous emission with two broad lines with maxima of ∼420 and 469 nm at 300 K. Upon excitation with light at wavelengths of <200 nm, the distinct zero-phonon lines of N3 and N4 centers in diamond at a temperature of 13 K become prominent at 416.0 and 491.2 nm, respectively. The vibrational progressions in the photoluminescence excitation (PLE) spectra of N2, N3, and N4 centers in diamond of type IaAB at 13 K are identified for the first time. We suggest the use of PL spectra excited in the region of 160-240 nm to analyze and identify the type of diamond.

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“…The disappearance of the strong band at B2.00 eV was attributed to the quenching of the defects in the diamond with the heating at 1300 1C under hydrogen plasma. The band at B1.88-2.02 eV is due to nitrogen related defects (NV 0 ), [29][30][31] whereas a small broad band at 2.47 eV (Fig. 5a) is due to nitrogen related defects [H3 (2.46 eV) and H4 (2.49 eV)] or carbon related defects [3H (2.43 eV)].…”

“…5a) is due to nitrogen related defects [H3 (2.46 eV) and H4 (2.49 eV)] or carbon related defects [3H (2.43 eV)]. [31][32][33] Kupriyanov et al observed a sharp zero phonon line (ZPL) at 2.75 eV (B450 nm) with replicas, which appeared on a PL spectrum measured from heat-treated (2500 1C) HPHT diamond at 77 K. 34 They assigned the 2.75 eV peak to ZPL. Martineau et al summarized the common features observed in the spectra of some as-grown and HPHT-treated CVD diamond as a table where the PL signals such as the 425 nm (B2.92 eV), and 451-459 nm (2.75-2.70 eV) series of lines, and 503 nm (2.47 eV) (observable from our hybrid samples: Fig.…”

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“…Among them, nitrogen is the more common color center of diamond leading to a variety of defects called A-, B-, C-N2, N3 centers. In the visible, their characteristic absorption transitions fall at 575, 527, 478, 465, 452, 435, and 423 nm [272][273][274]. Concentration of nitrogen defects is used to classify diamond in type Ia with about 95% of all natural diamonds where the nitrogen impurities are~0.3% (3000 ppm).…”

Quantitative Analysis of Nitrogen Defect N4 in Diamond with Photoluminescence Excited in the 170–240 nm Region

“…[20][21][22][23][24][25] With the PL technique, our previous work still had limitations to achieve quantitative information. [18][19] In the present work, we investigated the quantitative analysis of nitrogen defect N4 in diamond detecting the PL excitation (PLE) at 236 nm, demonstrating that the sensitivity can attain a ppb level.…”

“…As diamond is the hardest natural material and can be dissolved intact in no solvent, these properties hinder its preparation for the measurement of absorption spectra, for which purpose a sample must typically be treated as a film, pellet or parallel disc. To solve 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 3 this problem, we applied photoluminescence (PL) for the analysis of various diamonds excited with radiation from a synchrotron source; [18][19] one can thereby analyze and identify the nitrogen defects in a diamond from its luminescence with excitation in the wavelength range 170-240 nm. The greatest advantage of this analytical technique is that a diamond sample remains intact and entirely undamaged during this PL analysis.…”