Mn

Journal of Luminescence 24/25 (1981)261-264 North-Holland Publishing Conspany

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261

TILE MEOHA1-li 0.0 00 TOE IR000I 111100 11-FlOORD oNooNcooRit 00 100 ORANgE FOiWOTON oN znt.-/on 1, N. Grosser, ash A. Ocharnann One LItre ton Fhvsiksi inches Thsoitst Our -isstuc—Liohig—Oniversit.it lltsinricli—dnff—Ri.ne ., 0—0000 Oiessen, F .0. Oorc~any

In contrast to high ennre.y H ectrnciagnetsc radiation (X—rays heavy porticl. o irradiation (protons) sntro•dnces ~trong radia— sion daaae In OnO. Au ross temperature and bolow she ions— I :nrsnoscence snteescty raoidly decroases. Eta deterioration :.lepenhs on the nnahnr of the incidont ions. The orange omission of IctO/Nn toGa-sos in the sane. way at the initiat stags of irradiat ion. Ihereaftor, doe to a ehango of the oscillator strnng1..h the srange Inainesconce increases. the enhancoment rosa1 ts. from an exchango ~ntoracli.oa between Nn~+ ions and radiation induced defects).

INl000tDtlOt High energy particle radiation can change ti:e optioe.l properties of tt—Vi con— pounds by creatinc now utofect centres in the. lattice. While in highty ionic cuatc— nab radiclysis is the d.oainant radiation daaage process, the lnminescence of 0n0 crystals Is strongly inflsenc.ed by elastic collision damage. One to the cell ision of mci dent particlos with l.attice atoms Frenkel dofects are prodnced which rep— rc.sent deep ce.ntros for radiationb ass transit-inns. in those materials ( 1—i) crystalsexposed to ion irradiation nsrmadiy show a very strong damage -cf tcai nes-— conce, where the highor encrgy fhcoroscence resoonds sore sens.itively to the radi— asion than the lower energy emission tands Etc nrpnse of this paper is to ii lnstrate that elastic coll.isinn damage is- prow— alcnt in t1nO/iIn and to show how nnder proton excitation the orange eaission hoe to manganese after an inFti el deterioration ag)ain increases. EXFNitIOhNOAh The bnO crystals nscd were d.oped by different aaonnts of manganese. thoy wern irradiated with X—rays (50 hO, 0-i mA) at ONcE or with 1 NeW prntens at tOT and NT. the specimons were held at the desired tomperatsre in cryostats for optical meas— :sremc.nts. the ionob nminescence spectra were observed with a tines spectmcgraph and rccnrdcd by an ap~repriste photographic unit. taminescence measurements were mIsc made by asing a mcnechrcaaeor together with an OWl 5555 7/A phntomnltiplier tote and the, proper electronics.

0000tTO The spectral energy distribnsion of the orange luminescence of a ZnO/) 1 10—i )yrn cryslal excited by F—rays at tOeT is ahown in fig. 1. The main cern phonen i.ine of the cubic structure at 17591 cm1 serves as reference line for the satellite lines and the phenen side bands. The spectrum characterises a mainly cubic ZnO crystal with stacking faalts (5). Orol.onged irradiation with F—rays hoes net lead

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Figure 3 Icnnluminoscence spectra nf a NnN/(l.1O~)Mn crystal at NT and LNT. creasing arange emission intensity with growing number of incident protons only at INT (fig. 2), in ynd/(1~1ad3)Mn this process is effective bnth at NT and LIlT (fig. i). dince NnN phosphors possess a noraal radiatinn damage behaviour, the produced defect cnncentratinn increases with decreasing temperatore. Thus, we can canclude from the ionolumlnescence spectra that the observed strange feature nf the orange emission nf NnN/tln depends on the distance between radiation induced defects and NnN+ inns.

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eaorou5 Figure 3 Damage curves nf ZnN/(l.1ad3)Mn pnwder under 1 SlaV protno irradiatinn at NT. As already mentinned above, Nng/Mn pnwder phosphnrs emit additionally La the orange luminescence, green and blue flucrescence bands. These latter bands are daaaged only. The innoluminescence intensity I satisfies the equation of Nanle and han (2) I = 1 0/l+fN, where I~ is the initial luminescence intensity, N is the nuaber of the incident protons and D is the so—called damage constant (fig. 3 and 5). The orange emission of the InN/tin powders behaves in the same way only at the initial stage of irradiation. This behaviour is clearly illustrated in fig. 3. Thereafter, the orange emission strongly increases, rises to a maximum and afterwards decreases again very slowly. The same holds for the ZnN/Mn crystals as shown in fig. 6. At LNT the radiation induced maximum of the orange emission is achieved already at a very low proton dose (fig. 6).

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