Synthesis and Characterization of Tb3+-Activated TiO2 Photoluminescence Nanomaterials

Yıl 2020, , 325 - 330, 15.05.2020

İdil Aritman

https://doi.org/10.21205/deufmd.2020226502

Öz

As compared to other
semiconductor photocatalysts, titanium dioxide has
so far
been shown
to be
the  most promising material used
for both
fundamental research and practical applications,
because it exhibits a
higher photoreactivity and it is
cheap, nontoxic, chemically and biologically
inert, and photostable. Rare earth ions (RE³⁺)
are preferred
as dopant
elements due to their high
densities and  high
light yields. Tb³⁺ doped
TiO₂nanoparticles offer
several advantages such as broad absorption
band, high emission intensity, long
lifetime, stability. TiO2: 1%Tb³⁺ nanoparticles, were produced
at 550
degrees by the sol-gel method.
Particle size analysis, XRD, DTA-TG,
FTIR, SEM, and PL analyzes 
of  the synthesized nanomaterials were performed. In
the anatase
crystal structure, the dimensions
of the
nanoparticles were measured below 100
nm and
were observed
in the 
microstructure where the  particles
were clustered
in places.
When the
nanoparticles were excited at 275 nm,
green emission bands of Tb³⁺
ions at 544 nm and 585
nm were
observed. This wavelength is attributed to
electronic transitions ⁵D₄→ ⁷F₅
and ⁵D₄ → ⁷F₄,
respectively.

Anahtar Kelimeler

TiO2, Photoluminescence, Sol-gel, Rare Earth Element

Tb3+ ile Aktive Edilmiş TiO2 Fotolüminesans Nanomalzemelerin Sentezi ve Karakterizasyonu

Öz

Diğer fotokatalitik yarı iletkenlere
kıyasla, titanyum dioksitin şimdiye dek
hem temel
araştırmalarda   hem de
pratik uygulamalarda kullanılan en umut
verici malzeme olduğu gösterilmiştir,
çünkü daha yüksek bir foto
reaktivite sergiler ve ucuz, toksik
olmayan, kimyasal ve biyolojik olarak etkisiz
ve 
kararlıdır. Nadir toprak
iyonları (RE³⁺),
yüksek yoğunlukları ve yüksek ışık verimleri nedeniyle
dopant elementler olarak tercih edilir.
Tb³⁺ katkılı TiO₂nanopartikülleri,
geniş emme bandı, yüksek 
emisyon yoğunluğu, uzun ömür, stabilite
gibi birçok
avantaj sunar. Ti0₂:%1 Tb³⁺ nanopartiküller sol-jel
yöntemi ile 550oC’ de üretildi. Sentezlenen
nanomalzemelerin partikül boyut
analizi, XRD, DTA-TG, FTIR, SEM
ve PL
(photo luminescence) analizleri yapılmıştır.
Anataz kristal yapısında, nanopartiküllerin
boyutları 100 nm'nin altında ölçülmüş
ve partiküllerin
yer yer kümelendiği mikroyapıda gözlenmiştir. Nanopartiküller 275 nm'de uyarıldığında,
544 nm
ve 585 nm'de Tb3+ iyonlarının yeşil
emisyon bantları gözlenmiştir. Bu dalga
uzunluğu, sırasıyla ⁵D₄→ ⁷F₅
and ⁵D₄ → ⁷F₄  elektronik
geçişlerine bağlanmaktadır.

Anahtar Kelimeler

TiO2, Foto Lüminesans, Sol-gel, Nadir Toprak Elementler

Kaynakça

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