CA1089641A - Luminescent screen - Google Patents
Luminescent screenInfo
- Publication number
- CA1089641A CA1089641A CA266,510A CA266510A CA1089641A CA 1089641 A CA1089641 A CA 1089641A CA 266510 A CA266510 A CA 266510A CA 1089641 A CA1089641 A CA 1089641A
- Authority
- CA
- Canada
- Prior art keywords
- luminescent
- borate
- sro
- luminescent screen
- formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/774—Borates
Abstract
ABSTRACT:
A luminescent alkaline earth borate activated by bivalent europium of the formula Sr1-x-pMoxEupB4O7, where Me represents at least one of the elements bariu and magnesium and where 0 < x ? 0.25 and 0.003 ? p ? 0 The luminescent borate omits in a narrow band with a maximum at 368 nm and may be used in low-pressure mercury vapor discharge lamps.
A luminescent alkaline earth borate activated by bivalent europium of the formula Sr1-x-pMoxEupB4O7, where Me represents at least one of the elements bariu and magnesium and where 0 < x ? 0.25 and 0.003 ? p ? 0 The luminescent borate omits in a narrow band with a maximum at 368 nm and may be used in low-pressure mercury vapor discharge lamps.
Description
PHN. 8241.
~{3g6~ :
The invention relates to a luminescent screen provided with a luminescent alkaline earth borate acti-vated by bivalent europium. Furthermore, the invention relates to a low-pressure mercury vapour discharge lamp provided with such a luminescent screen and to the luminescent borate itseIf.
Activating alkaline earth borates by bivalent europium is known. Materials are obtained which, when excited by ultraviolet radiation show the relatively narrow band emission of bivalent europium. Depending on the host lattice used this emission band is located in the deep blue or the near ultraviolet part of the spectrum. The barium octaborate (BaB8013) activated ;
by bivalent europium, which has an emission band having its maximum value at approximately 400 nm is known.
United States Patent Specification 3,657,141 discloses ~ -strontium fluoroborate (SrB406 5F) which is activated by bivalent europium and the emission band of which has its maximum value at approximately 370 nm. A disadvan-2Q tage of the known fluoroborate is that it is difficult to produce and may give rise to an undesired release o~
fluorine into the atmosphere. Japanese Patent Applica-tion 74/67,892 which has ~een ~aid open to public inspec~
,"'' ': ,'
~{3g6~ :
The invention relates to a luminescent screen provided with a luminescent alkaline earth borate acti-vated by bivalent europium. Furthermore, the invention relates to a low-pressure mercury vapour discharge lamp provided with such a luminescent screen and to the luminescent borate itseIf.
Activating alkaline earth borates by bivalent europium is known. Materials are obtained which, when excited by ultraviolet radiation show the relatively narrow band emission of bivalent europium. Depending on the host lattice used this emission band is located in the deep blue or the near ultraviolet part of the spectrum. The barium octaborate (BaB8013) activated ;
by bivalent europium, which has an emission band having its maximum value at approximately 400 nm is known.
United States Patent Specification 3,657,141 discloses ~ -strontium fluoroborate (SrB406 5F) which is activated by bivalent europium and the emission band of which has its maximum value at approximately 370 nm. A disadvan-2Q tage of the known fluoroborate is that it is difficult to produce and may give rise to an undesired release o~
fluorine into the atmosphere. Japanese Patent Applica-tion 74/67,892 which has ~een ~aid open to public inspec~
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.. . . .
:
'~" ' ,"~ "
. , ., : , . .. .. , : ... ., ,. . .. . : . .. . ..
:
PIIN ~21l1 1089641 1 1. 11 . 7G
ti.on, disclose.s a calc:ium conta:in:in~ strontiul1l tetra-bo:rate wh:ich i s ae-tivated by blvalent europiulll, for examp]e SrO 9CaO 1BI~07. 1~hen exci-ted by shortwave ultl~a-vio].e-t radiation this n1ate:rial has an er~:ieieIlt emission w]lose maxilnum vcLlue is at approxinlately 370 nm and a hal~-wicl-th value o~ approxima-tely 20 ntn.
Sueh a narrow-halld emission in the l~ave].en6th ran.ge between 350 and 390 mn may be used to grea-t advantage for inf`lueneing photoehemieal proeesses sueh as lacquer ha:rden:ing, hardening of gypsurn, photo-po]ymerisation, xerograpby and SUC]1 like. It is an object of $he invention to provide new l~lmi-~nescent materials which may be used fcr such purpo ses.
A luminescent screen according to the inven-tion. i.s provided wi-th a lutninescen-t alkcnline earth bora$e, aetivated by bi.valent europiu:n ancl is eharae-~ terized in that the borate sat:isfies the for~lula : Sr1 MexEu Bll07, in. whicll Me sta.nds ~or a-t least : ` 20 one o:E -the ele~ne:nts barium and magnesi.~-lln and in whic:h 0 ~ x ~ 0.25 and 0.003 ~ p ~ 0.20.
The lun-l:inescent allcal:ine ear-th. borate in a ~ :
luminescen-t screen accorcling to t;he in~en-tioIl can be excited ver-y well by shortwave u:Ltravlol.et radi.at:ion ~or ex~ pl.e the racliatlon o:~ a low-prcssu.re mercu:ry VaPOIIr diSC1la.rge .1 anlP (nla:;.n]Y 25/~nm) . T~:Le ernlssion the-rJ. ohtainc~d :i.s a :na:l:row-~ban~l emiss:io:lL~i.tll.cL maxim~
. ~
. ' , :, : : '' . . :
.. :~ . , , : . , PIIN C~2ll1 1l.ll.76 969~
. al; appro~imately 368 nm and a hal~-wi{l-th value o~ ap-proxi.lllate].y 18 nm.
'l`he host lat-tice of -the lunlineseent nlater:Lals according to the inven-tion consists o:t` s-tront:i.ul11 tetraborate in which part of the s-trontium is re- ..
placed by ba*ium and/or lllagnesiun1. 'Nle crystal. s-truc-ture of stron-tium tetraborate (orthorllon1b:ic syl11n1etry) is maintained. It was surprisingly f`ourld that SUCIl a replaceme:nt resul-ts in an increase in the quantun1 e:~
ficiency and in the radiation output compa.red with the pure s-tron-tium tetraborate. A still lar~er gain in radlation output is obtained with respect to the known, ca:Leium-eontainirlg st:ron-tium tet~abora-teO It was ~ound that alreacly sma.1:L quan-ti.ties of bar:iu.m and/or magnesi.um gi-ve ri.se to an increase in the : .
radiation output. ~t a value of lhe bari.um- and./or magnesium contents x equal to 0.05, ~or example, a ::
. considerab:Le gain'lmay already be obtainecl. I~len Large . quantiti.es of the stron-tiuni are replacecl by ba:riu ancd/or magMesill~n tlle radiat:ioIl o-u-tput decreases again. :
: Thererore not mo:re than 25 rnol.% of the s-tront:i.wl1 (x ~ O. 25) is repl.aced. The eu:ropium content p may be chosen be-tween the above-menti.oned w:i.de li.mils. -' ' For va:lues o~ p ~rll:;.cl~ a:re smaller -than 0.003, ra--diation outputs are obtai.ned w}l:icJl are too sma:l.:l. ' ' I'or p:ract;i.cal purposes and :~or values oI' p wh:ic}l ex-eeed 0,20 the :radi.lLt;.i.on OUtpllt beeolrles -too sma:l.l ow- ::
PI~N 82 ~T 1 11.11.76 ~85~64~
. img to concelltra-t:ioll querlclling~
part:icu:l.ar advanl,age o~ the luminescent ~orates accorcling to the invention i5 that -they can he obtained as a compa:rative:Ly coarse-grained powder.
Tllis applies especially to -the magnesium-subs-tituted borates according to the inventlon wh,ose average gra;.n size (determined by means Or -the ~isher Su'b Sieve 5izer) is approximately 5.0/u. It is much easier to apply such a powder in a luminescent screen than the known calciwn containing strontium tetraborate (approximately 1.5/u) and the known pure strontium -tetraborate (approximately 303/u) obtained in a similar manner, l~ur-thermore, the lurninescent properties O:r such a co,arse-grained powcler are preserved nluch better when apply~ing it in screens.
.
15~ The 'highest radiant e:~f,iciencies are o'btain-ed with bora-tes which satisfy the above-men-tioned for~
.- .
' mula, where 0.05 ~ x ~ 0.20 ancl 0.01~ p ~ 0.05. There- ', fore these values o~ x and p are p:referrecl.
A luminescent screen according -to -the i.nven-ti.on LS pre:~erably u.setl in a low-pressll:re morcury vapour d:ischarge :Lamp as the luminescellt borates are opl;imal:ly exci-ted by -the 25LI nm rad.iation o:~
s-uch a lamp.
'I'h,e inven-tion wil:l now be fur-tller exp:Lain-. . .
e-l with rererence to a num1~er of examp:Les antl measure~ ' ments and a drawingr.
lrL the draw~.ng D'iB. 1 S]l.OWS C~ agrall:llllal;iCa lly -. PllN 82ll1 964~ 1.7G
a low-p:ressllre me.rcury vapo1l:r discharge :Lamp acco:rdin~
l;o -l;l~.e :inventi.on. ancl Fig. 2 shows -the spec-tral el1er~y dist:r:i.b-ut:;on o:[` the emitte(l rac1.iation o~ two boral.es accord:ill~ to the inven.tio~
~igr. 1 shows a low pressure mercury vapour discharge lamp wlt]l an enve:10pe 1. l~lectrodes 2 and
.. . . .
:
'~" ' ,"~ "
. , ., : , . .. .. , : ... ., ,. . .. . : . .. . ..
:
PIIN ~21l1 1089641 1 1. 11 . 7G
ti.on, disclose.s a calc:ium conta:in:in~ strontiul1l tetra-bo:rate wh:ich i s ae-tivated by blvalent europiulll, for examp]e SrO 9CaO 1BI~07. 1~hen exci-ted by shortwave ultl~a-vio].e-t radiation this n1ate:rial has an er~:ieieIlt emission w]lose maxilnum vcLlue is at approxinlately 370 nm and a hal~-wicl-th value o~ approxima-tely 20 ntn.
Sueh a narrow-halld emission in the l~ave].en6th ran.ge between 350 and 390 mn may be used to grea-t advantage for inf`lueneing photoehemieal proeesses sueh as lacquer ha:rden:ing, hardening of gypsurn, photo-po]ymerisation, xerograpby and SUC]1 like. It is an object of $he invention to provide new l~lmi-~nescent materials which may be used fcr such purpo ses.
A luminescent screen according to the inven-tion. i.s provided wi-th a lutninescen-t alkcnline earth bora$e, aetivated by bi.valent europiu:n ancl is eharae-~ terized in that the borate sat:isfies the for~lula : Sr1 MexEu Bll07, in. whicll Me sta.nds ~or a-t least : ` 20 one o:E -the ele~ne:nts barium and magnesi.~-lln and in whic:h 0 ~ x ~ 0.25 and 0.003 ~ p ~ 0.20.
The lun-l:inescent allcal:ine ear-th. borate in a ~ :
luminescen-t screen accorcling to t;he in~en-tioIl can be excited ver-y well by shortwave u:Ltravlol.et radi.at:ion ~or ex~ pl.e the racliatlon o:~ a low-prcssu.re mercu:ry VaPOIIr diSC1la.rge .1 anlP (nla:;.n]Y 25/~nm) . T~:Le ernlssion the-rJ. ohtainc~d :i.s a :na:l:row-~ban~l emiss:io:lL~i.tll.cL maxim~
. ~
. ' , :, : : '' . . :
.. :~ . , , : . , PIIN C~2ll1 1l.ll.76 969~
. al; appro~imately 368 nm and a hal~-wi{l-th value o~ ap-proxi.lllate].y 18 nm.
'l`he host lat-tice of -the lunlineseent nlater:Lals according to the inven-tion consists o:t` s-tront:i.ul11 tetraborate in which part of the s-trontium is re- ..
placed by ba*ium and/or lllagnesiun1. 'Nle crystal. s-truc-ture of stron-tium tetraborate (orthorllon1b:ic syl11n1etry) is maintained. It was surprisingly f`ourld that SUCIl a replaceme:nt resul-ts in an increase in the quantun1 e:~
ficiency and in the radiation output compa.red with the pure s-tron-tium tetraborate. A still lar~er gain in radlation output is obtained with respect to the known, ca:Leium-eontainirlg st:ron-tium tet~abora-teO It was ~ound that alreacly sma.1:L quan-ti.ties of bar:iu.m and/or magnesi.um gi-ve ri.se to an increase in the : .
radiation output. ~t a value of lhe bari.um- and./or magnesium contents x equal to 0.05, ~or example, a ::
. considerab:Le gain'lmay already be obtainecl. I~len Large . quantiti.es of the stron-tiuni are replacecl by ba:riu ancd/or magMesill~n tlle radiat:ioIl o-u-tput decreases again. :
: Thererore not mo:re than 25 rnol.% of the s-tront:i.wl1 (x ~ O. 25) is repl.aced. The eu:ropium content p may be chosen be-tween the above-menti.oned w:i.de li.mils. -' ' For va:lues o~ p ~rll:;.cl~ a:re smaller -than 0.003, ra--diation outputs are obtai.ned w}l:icJl are too sma:l.:l. ' ' I'or p:ract;i.cal purposes and :~or values oI' p wh:ic}l ex-eeed 0,20 the :radi.lLt;.i.on OUtpllt beeolrles -too sma:l.l ow- ::
PI~N 82 ~T 1 11.11.76 ~85~64~
. img to concelltra-t:ioll querlclling~
part:icu:l.ar advanl,age o~ the luminescent ~orates accorcling to the invention i5 that -they can he obtained as a compa:rative:Ly coarse-grained powder.
Tllis applies especially to -the magnesium-subs-tituted borates according to the inventlon wh,ose average gra;.n size (determined by means Or -the ~isher Su'b Sieve 5izer) is approximately 5.0/u. It is much easier to apply such a powder in a luminescent screen than the known calciwn containing strontium tetraborate (approximately 1.5/u) and the known pure strontium -tetraborate (approximately 303/u) obtained in a similar manner, l~ur-thermore, the lurninescent properties O:r such a co,arse-grained powcler are preserved nluch better when apply~ing it in screens.
.
15~ The 'highest radiant e:~f,iciencies are o'btain-ed with bora-tes which satisfy the above-men-tioned for~
.- .
' mula, where 0.05 ~ x ~ 0.20 ancl 0.01~ p ~ 0.05. There- ', fore these values o~ x and p are p:referrecl.
A luminescent screen according -to -the i.nven-ti.on LS pre:~erably u.setl in a low-pressll:re morcury vapour d:ischarge :Lamp as the luminescellt borates are opl;imal:ly exci-ted by -the 25LI nm rad.iation o:~
s-uch a lamp.
'I'h,e inven-tion wil:l now be fur-tller exp:Lain-. . .
e-l with rererence to a num1~er of examp:Les antl measure~ ' ments and a drawingr.
lrL the draw~.ng D'iB. 1 S]l.OWS C~ agrall:llllal;iCa lly -. PllN 82ll1 964~ 1.7G
a low-p:ressllre me.rcury vapo1l:r discharge :Lamp acco:rdin~
l;o -l;l~.e :inventi.on. ancl Fig. 2 shows -the spec-tral el1er~y dist:r:i.b-ut:;on o:[` the emitte(l rac1.iation o~ two boral.es accord:ill~ to the inven.tio~
~igr. 1 shows a low pressure mercury vapour discharge lamp wlt]l an enve:10pe 1. l~lectrodes 2 and
3 are disposed at -the ends o:~ the lamp be-t~een ~.~hich the dlsch.arge is~maintained. The ins;de of the en-velope 1 is coated ~ith a luminesce.ll-t la5rer 4 ~hich contains a luminescent borate according to the in-vention. This luminescen-t :Layer may be app].ied to the envelope 1 in a prior ar-t me-t:ilod. ~.
~ .
o.88 mo]e SrC03 0.10 mole BaC03 -~
: 0,01 mole ~u203 and 1~ 00 mole I-I B0 ..
are suspendecd in one litrc of water o~ 70C. I-JN03 :is aclded to this suspension so tha-t a so:Lution is ob- .:
tained. ~pproxima-tely 2 l o~ a mixt~ire (1 : 1 volume .
parts) oI` NlII~O~I and a po].ar orgall.ic solven~, for exan1ple acetone, are carefùlly ad.cled to thi.s so:l.u--t:ion so that a mi.xed hyclrox:i.de preci.pita-tes. T:he:re-a~`ter -the precip:i.-tate :is :~iltered o:~f and dri.ed. :~
Therea:rter it :is hea-ted ~o:r 2 hours at c~00C in ai.l~.
The product then obtained :Ls cooled a:ncl pulver:i.~.e(l whereafter lt is heatecl once mo:re~ now ~or 3,5 h.ol1.:rs .
,;
'' '" ' ., ' . ' :. , ~' ', . ' .
-- - lQ~964~ PH~J 82~1 at 920C in a nitrogen current which contains 0.75 vol.
of hydrogen. After cooling and pulverizing the lumines-cent material which satisfies the formula SrO 88BaO loEuo O
B407 is ready for use. The spectral energy distribution of this material at excitation by short-wave ultraviolet radiation (mainly 254 nm) is shown in Fig. 2 (curve 1).
In Fig. 2 the wavelength ~ (in nm) is plotted on the horizontal axis and the radiant energy E (in arbitrary units) on the vertical axis. The borate according to the invention appears to have its maximum of emission at 368.5 nm and to have a half-width value of 17.9 nm.
For comparison, Fig. 2 also shows the spectral energy distribution of the known lead-activated barium disili- ~;
cate, a luminescent material which up to the present has - -been frequently used in low-pressure mercury vapour discharge lamp for generating radiation in the ultra- ~-violet part of the spectrum (the dotted curve a).
Example II
The procedure as in Example I is repeated in which, however, 0.93 mole SrC03 and 0.05 mole BaC03 are used instead of the quantity specified in Example I. The luminescent material obtained has the formula SrO 93Bao.osEuo.o2 4 7 Example III
Example I is repeated but instead of the BaC03 0.05 mole MgC03.Mg(OH)2.3H20 is used. The material then obtained satisfies the formula SrO 88MgO loEuo 02B407.
. .. . . . .. . . .
- : , ~, . , -, , :
: . .
.- . ~ , :, , : ,: . , :
:
~L089~i41 11.11.7G
Curve 2 in Fig. 2 shows l;:ll.e spectral energ~ ~istri.bu-t:ion o:f` -thi.s mate:ri a] .
e :r ~
._ .
Examp:le I is repeated, w:ith t:he prov.is:ion that the :~irst heating for 2 hours in a:ir is now perf'ormed at a tem-perature oI` 850C. The product obtainecl has the same ~ormula as the material o~ examp:Le I. The average graiIl diameter of the powder is 4.2/u.
E.xarllp.l e V . :
Exal11ple I is again repeated, howeve:r, the :~irst heat-ing operation is er~ected at 900C.,The luminescent .
materi.al obtained which sa-tis:ries -the formula speci-fied i.n Example ,1, has an average grain dian1eter o~ . .
6.7/~
Exam~le VI .' ' A materi.al with -tlhe for1nula as speci.:~ied in Example I -~
Y 0.88 ao.1oEuo.o2B4o~7 may also be obtained by carefully Il1i.xing in a ball mlll~
o.88 mole SrC03 0.10 mole BaC03' 0.01 mole Eu203 ~ :
1~.oo mole 113B03 ..
~ : Theree.fter th.e mixture is heated in air in an open.
: crucih]e :~or 2 hours at 850C. A:~ter cooling the pro~
duct obtai.rled i.~s pulveri7,ed and t}len heatecl a~air1, .
now ~o:r 3.5 hours at 920C .i.n n.itro~roll atmospb.ere whi.cl]. con-tai:ns 0.75 voL./~o o:l' h~d:rogerl. Af'ter cooli1~g .
PllN ~2~
1 1 . 1 1 . 7 G
~(3896~
and pulveri~ g t:b.e lumi.n.escent borate is ready for use.
The resu.lts o~ measurclllents on tlle materi.als obta-i.ned w:ith the exal1l]?les menti.on.ed above are sum-ma.rized i.n the table herebelow. Eor each example tlhe table states, besi.des the ~ormula o~ the ]umilLescent material, in the column LO th.e ultraviolet-radlation ou-tput in ~ wi-th respect to the radi.ation output o:~
the known, lead-acti~ated bari.um disilicate, and in tlle column dm the average grain diameter in /um. Eor comparison the measurements on the known s-trontium tetrabora-te and the kno~n calc:Lwn-contai.ning stron-ti.um tetrabora-te and the known s~ron-tium :~luoroborate respectively, are gi~ren as examples a, b and c. These ~ 15 ~ known materials are prepareci. i:rL the same manner as L
: ~ : speci:ried in Example I.
~:
~: .
` , :
:
: ' :
_ 9 _ . .. . ...
~I-IN 82 ~ 1 11.11.76 64~ ~
~ Exalllplc ~ormllla LO ( ~) dnl(/ul f) ~ _____ a SrO 98EUo~ 02 /l 7 208 3~ 3 b SrO 88Cao .10 0 ~ o2B407 184 1.5 c SrO 9gEUo . o2Bl~o6. 5 168 2.2 I SrO 88BaO.10~U0.02 4 7 226 3.4 II SrO 93Bao. o5Euo~ 02 4 7 224 _ III SrO 88Mgo . 1 oEuo . 02 1~ 7 218 5.0 IV SrO ggBao.1oE~lo. o2 /~ 7229 4.2 V SrO ggBao.1oEllo.o2 /~ 7 22~ 6.7 VI SrO 88BaO.10EUO.OZ 4 7 224 /f .7 . ~"'.
-..
.
'.'.
', "
~ .
o.88 mo]e SrC03 0.10 mole BaC03 -~
: 0,01 mole ~u203 and 1~ 00 mole I-I B0 ..
are suspendecd in one litrc of water o~ 70C. I-JN03 :is aclded to this suspension so tha-t a so:Lution is ob- .:
tained. ~pproxima-tely 2 l o~ a mixt~ire (1 : 1 volume .
parts) oI` NlII~O~I and a po].ar orgall.ic solven~, for exan1ple acetone, are carefùlly ad.cled to thi.s so:l.u--t:ion so that a mi.xed hyclrox:i.de preci.pita-tes. T:he:re-a~`ter -the precip:i.-tate :is :~iltered o:~f and dri.ed. :~
Therea:rter it :is hea-ted ~o:r 2 hours at c~00C in ai.l~.
The product then obtained :Ls cooled a:ncl pulver:i.~.e(l whereafter lt is heatecl once mo:re~ now ~or 3,5 h.ol1.:rs .
,;
'' '" ' ., ' . ' :. , ~' ', . ' .
-- - lQ~964~ PH~J 82~1 at 920C in a nitrogen current which contains 0.75 vol.
of hydrogen. After cooling and pulverizing the lumines-cent material which satisfies the formula SrO 88BaO loEuo O
B407 is ready for use. The spectral energy distribution of this material at excitation by short-wave ultraviolet radiation (mainly 254 nm) is shown in Fig. 2 (curve 1).
In Fig. 2 the wavelength ~ (in nm) is plotted on the horizontal axis and the radiant energy E (in arbitrary units) on the vertical axis. The borate according to the invention appears to have its maximum of emission at 368.5 nm and to have a half-width value of 17.9 nm.
For comparison, Fig. 2 also shows the spectral energy distribution of the known lead-activated barium disili- ~;
cate, a luminescent material which up to the present has - -been frequently used in low-pressure mercury vapour discharge lamp for generating radiation in the ultra- ~-violet part of the spectrum (the dotted curve a).
Example II
The procedure as in Example I is repeated in which, however, 0.93 mole SrC03 and 0.05 mole BaC03 are used instead of the quantity specified in Example I. The luminescent material obtained has the formula SrO 93Bao.osEuo.o2 4 7 Example III
Example I is repeated but instead of the BaC03 0.05 mole MgC03.Mg(OH)2.3H20 is used. The material then obtained satisfies the formula SrO 88MgO loEuo 02B407.
. .. . . . .. . . .
- : , ~, . , -, , :
: . .
.- . ~ , :, , : ,: . , :
:
~L089~i41 11.11.7G
Curve 2 in Fig. 2 shows l;:ll.e spectral energ~ ~istri.bu-t:ion o:f` -thi.s mate:ri a] .
e :r ~
._ .
Examp:le I is repeated, w:ith t:he prov.is:ion that the :~irst heating for 2 hours in a:ir is now perf'ormed at a tem-perature oI` 850C. The product obtainecl has the same ~ormula as the material o~ examp:Le I. The average graiIl diameter of the powder is 4.2/u.
E.xarllp.l e V . :
Exal11ple I is again repeated, howeve:r, the :~irst heat-ing operation is er~ected at 900C.,The luminescent .
materi.al obtained which sa-tis:ries -the formula speci-fied i.n Example ,1, has an average grain dian1eter o~ . .
6.7/~
Exam~le VI .' ' A materi.al with -tlhe for1nula as speci.:~ied in Example I -~
Y 0.88 ao.1oEuo.o2B4o~7 may also be obtained by carefully Il1i.xing in a ball mlll~
o.88 mole SrC03 0.10 mole BaC03' 0.01 mole Eu203 ~ :
1~.oo mole 113B03 ..
~ : Theree.fter th.e mixture is heated in air in an open.
: crucih]e :~or 2 hours at 850C. A:~ter cooling the pro~
duct obtai.rled i.~s pulveri7,ed and t}len heatecl a~air1, .
now ~o:r 3.5 hours at 920C .i.n n.itro~roll atmospb.ere whi.cl]. con-tai:ns 0.75 voL./~o o:l' h~d:rogerl. Af'ter cooli1~g .
PllN ~2~
1 1 . 1 1 . 7 G
~(3896~
and pulveri~ g t:b.e lumi.n.escent borate is ready for use.
The resu.lts o~ measurclllents on tlle materi.als obta-i.ned w:ith the exal1l]?les menti.on.ed above are sum-ma.rized i.n the table herebelow. Eor each example tlhe table states, besi.des the ~ormula o~ the ]umilLescent material, in the column LO th.e ultraviolet-radlation ou-tput in ~ wi-th respect to the radi.ation output o:~
the known, lead-acti~ated bari.um disilicate, and in tlle column dm the average grain diameter in /um. Eor comparison the measurements on the known s-trontium tetrabora-te and the kno~n calc:Lwn-contai.ning stron-ti.um tetrabora-te and the known s~ron-tium :~luoroborate respectively, are gi~ren as examples a, b and c. These ~ 15 ~ known materials are prepareci. i:rL the same manner as L
: ~ : speci:ried in Example I.
~:
~: .
` , :
:
: ' :
_ 9 _ . .. . ...
~I-IN 82 ~ 1 11.11.76 64~ ~
~ Exalllplc ~ormllla LO ( ~) dnl(/ul f) ~ _____ a SrO 98EUo~ 02 /l 7 208 3~ 3 b SrO 88Cao .10 0 ~ o2B407 184 1.5 c SrO 9gEUo . o2Bl~o6. 5 168 2.2 I SrO 88BaO.10~U0.02 4 7 226 3.4 II SrO 93Bao. o5Euo~ 02 4 7 224 _ III SrO 88Mgo . 1 oEuo . 02 1~ 7 218 5.0 IV SrO ggBao.1oE~lo. o2 /~ 7229 4.2 V SrO ggBao.1oEllo.o2 /~ 7 22~ 6.7 VI SrO 88BaO.10EUO.OZ 4 7 224 /f .7 . ~"'.
-..
.
'.'.
', "
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A luminescent screen provided with a lumines-cent alkaline earth borate, activated by bivalent euro-pium, characterized in that the borate satisfies the formula Srl-x-pMexEupB4o7, where Me represents at least one of the elements barium and magnesium and where O ? x 0.25 and 0.003 ? p ? 0.20.
2. A luminescent screen as claimed in Claim 1, characterized in that 0.05 ? x ?0.20 and 0.01 ? p ? 0.05.
3. A luminescent alkaline earth borate activated by bivalent europium satisfying the formula Sr1-x-pMexEupB4o7, where Me represents at least one of the elements barium and magnesium and where O ? x ? 0.25 and 0.003 ? p ? 0.20.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7513897 | 1975-11-28 | ||
| NL7513897A NL178549C (en) | 1975-11-28 | 1975-11-28 | LUMINESCENT SCREEN; LOW-PRESSURE MERCURY DISCHARGE LAMP; PROCESS FOR THE PREPARATION OF AN EARTH-LIQUID METAL TRABORATE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1089641A true CA1089641A (en) | 1980-11-18 |
Family
ID=19824937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,510A Expired CA1089641A (en) | 1975-11-28 | 1976-11-24 | Luminescent screen |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5933157B2 (en) |
| BE (1) | BE848834A (en) |
| CA (1) | CA1089641A (en) |
| DE (1) | DE2652480C2 (en) |
| FR (1) | FR2333036A1 (en) |
| GB (1) | GB1509119A (en) |
| NL (1) | NL178549C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11255797B2 (en) | 2019-07-09 | 2022-02-22 | Kla Corporation | Strontium tetraborate as optical glass material |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8303798A (en) * | 1983-01-13 | 1984-08-01 | Philips Nv | LOW-PRESSURE MERCURY DISCHARGE LAMP. |
| JPS60258754A (en) * | 1984-06-05 | 1985-12-20 | Akai Electric Co Ltd | Tape reader drive mechanism of magnetic recording and reproducing device |
| DE3544800A1 (en) * | 1985-12-18 | 1987-06-25 | Philips Patentverwaltung | UVA LOW-PRESSURE MERCURY STEAM DISCHARGE LAMP FOR BROWNING PURPOSES |
| FR2597851B1 (en) * | 1986-04-29 | 1990-10-26 | Centre Nat Rech Scient | NOVEL MIXED BORATES BASED ON RARE EARTHS, THEIR PREPARATION AND THEIR APPLICATION AS LUMINOPHORES |
| US4719033A (en) * | 1986-08-28 | 1988-01-12 | Gte Products Corporation | Process for producing europium activated stronium tetraborate UV phosphor |
| US5023015A (en) * | 1989-12-19 | 1991-06-11 | Gte Products Corporation | Method of phosphor preparation |
| JP2003306674A (en) * | 2002-04-15 | 2003-10-31 | Sumitomo Chem Co Ltd | Fluorescent material for white led, and white led using the same |
| CN103215035A (en) * | 2012-12-21 | 2013-07-24 | 彩虹集团电子股份有限公司 | Europium excited strontium magnesium borate ultraviolet phosphor and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6806648A (en) * | 1968-05-10 | 1969-11-12 | ||
| JPS511672B2 (en) * | 1972-11-02 | 1976-01-19 |
-
1975
- 1975-11-28 NL NL7513897A patent/NL178549C/en not_active IP Right Cessation
-
1976
- 1976-11-18 DE DE19762652480 patent/DE2652480C2/en not_active Expired
- 1976-11-24 CA CA266,510A patent/CA1089641A/en not_active Expired
- 1976-11-25 JP JP14081276A patent/JPS5933157B2/en not_active Expired
- 1976-11-25 GB GB4920976A patent/GB1509119A/en not_active Expired
- 1976-11-26 BE BE172780A patent/BE848834A/en not_active IP Right Cessation
- 1976-11-26 FR FR7635733A patent/FR2333036A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11255797B2 (en) | 2019-07-09 | 2022-02-22 | Kla Corporation | Strontium tetraborate as optical glass material |
Also Published As
| Publication number | Publication date |
|---|---|
| NL178549B (en) | 1985-11-01 |
| JPS5933157B2 (en) | 1984-08-14 |
| NL178549C (en) | 1986-04-01 |
| GB1509119A (en) | 1978-04-26 |
| FR2333036A1 (en) | 1977-06-24 |
| NL7513897A (en) | 1977-06-01 |
| FR2333036B1 (en) | 1981-04-17 |
| DE2652480C2 (en) | 1984-12-06 |
| DE2652480A1 (en) | 1977-06-02 |
| BE848834A (en) | 1977-05-26 |
| JPS5266425A (en) | 1977-06-01 |
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