Besides the greenish-blue one,the orange phosphorescence(-590 nm,2.1 eV),reported by Watanabe et al.,in 1997,is another diagnostic feature for separating high-pres-sure-high-temperature(HPHT)synthetic diamonds from others.Interestingly,the green-ish-blue phosphorescence probably has some connection with the orange one.For instance,the greenish-blue one decays much faster in diamonds which contain both phosphorescence features.However,the basic description of the orange phosphorescence is still limited.U-sing photoluminescence(PL),thermoluminescence(TL)and other technologies,we charac-terized the optical features of the orange phosphorescence.It is highly likely due to other de-fects,rather than the nitrogen-boron pair(Zhao et al.,2023;Zhang et al.,2023),for its distinct excitation,polarization and thermoluminescence features.
HPHT synthetic diamondkinetics of luminescencephosphorescencethermolu-mine scencepolarized spectrum
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