TY - JOUR
T1 - Ternary cadmium sulphide selenide quantum dots as new scintillation materials
AU - Brown, S. S.
AU - Rondinone, A. J.
AU - Pawel, M. D.
AU - Dai, S.
PY - 2008
Y1 - 2008
N2 - Monodisperse, highly luminescent, zinc blende, cadmium sulphide selenide (CdSxSe1-x, x=mole fraction of sulphur) quantum dots (QDs) were prepared in gram scales in the particle size range 2.6-4.3 nm. With the varying S and Se contents, emission wavelengths of CdSxSe 1-x QDs were tuned from 439 to 581 nm (λexc.=370 nm). QDs were well dispersed in organic solvents and optically transparent plastic scintillators made with up to 10 wt-%QDs in polyvinyltoluene (PVT) were prepared. The result from alpha particle detection indicated the wavelengths match with the sensitivity of the photomultiplier tube. Pulse height peaks of (CdSxSe1-x with the wavelength of emission from 439 to 482 nm, appeared around 0.35 (channel no./amplifier gain), with different photon counts. No pulse height peak was observed with QDs that emitted at 505 nm or longer wavelengths. Under studied conditions, CdS0.95Se 0.05 was found to be the most efficient scintillator.
AB - Monodisperse, highly luminescent, zinc blende, cadmium sulphide selenide (CdSxSe1-x, x=mole fraction of sulphur) quantum dots (QDs) were prepared in gram scales in the particle size range 2.6-4.3 nm. With the varying S and Se contents, emission wavelengths of CdSxSe 1-x QDs were tuned from 439 to 581 nm (λexc.=370 nm). QDs were well dispersed in organic solvents and optically transparent plastic scintillators made with up to 10 wt-%QDs in polyvinyltoluene (PVT) were prepared. The result from alpha particle detection indicated the wavelengths match with the sensitivity of the photomultiplier tube. Pulse height peaks of (CdSxSe1-x with the wavelength of emission from 439 to 482 nm, appeared around 0.35 (channel no./amplifier gain), with different photon counts. No pulse height peak was observed with QDs that emitted at 505 nm or longer wavelengths. Under studied conditions, CdS0.95Se 0.05 was found to be the most efficient scintillator.
KW - Alloyed quantum dots
KW - Nanocrystal scintillator
KW - Semiconductor nanocrystals
KW - Ternary quantum dots
UR - http://www.scopus.com/inward/record.url?scp=72449148259&partnerID=8YFLogxK
U2 - 10.1179/175355508X310124
DO - 10.1179/175355508X310124
M3 - Article
AN - SCOPUS:72449148259
SN - 1066-7857
VL - 23
SP - 94
EP - 99
JO - Materials Technology
JF - Materials Technology
IS - 2
ER -