纳米材料双语翻译

姓名：

学号：

1012100105

班级：化学

1001

Photoluminescence properties of LaF

3

: Eu

3+

nanoparticles

prepared by refluxing method

光致发光性质：铕掺杂的三氟化镧纳米粒子的回流制备方法

Rare

earth

ions-doped

nanostructure

materials

have

been

widely

investigated because of their sharp and intense emission originating from

the electronic transitions within the 4f shell of the doping ions and their

applications

in

many

fields.

In

comparison

with

the

conventional

oxide-based

luminescent

materials,

fluorides

are

advantageous

as

fluorescent host materials owing to their low vibrational energies and the

subsequent

minimization

of

the

quenching

of

the

excited

state

of

the

rare-earth

ions

[1]

.

Hence,

rare

earth

ions-doped

nanostructural

fluorides

have

attracted

extensive

interests

due

to

their

potential

applications

in

lighting

and

displays

[2,3]

,

upconverters

[3?8]

,

magnetic

resonance

imaging

(MRI)

[9]

,

biological

fluorescent

[10?14]

,optical

amplifiers

[15]

,

transparent

glass

[16]

,

scintillators

[17]

,

photonic

crystals

[18]

,

etc.

Among

these fluorides, LaF

3

host matrix exhibits the photochemical stability, the

biocompatibility,

and

the

relative

low

crystalline

temperature,

and

its

phonon energy is as low

as 350 cm?1

[19,20]

. Rare earth ions (Eu

3+

, Ce

3+

,

Tb

3+

, Nd

3+

, Er

3+

, Pr

3+

, Ho

3+

, Yb

3+

, Tm

3+

) doped LaF

3

nanoparticles

[21?24]

< br>,

LaF

3

triangular

nanoplates

[24,25]

,

and

silica- coated

[19]

,

or

organic

ligands

[2 0,26]

modified LaF

3

luminescent

nanoparticles have

been

reported

in literatures.

稀土离子掺杂的纳米结构材 料已被广泛研究，

因为其尖锐和激烈的排放来源

于电子跃迁的< /p>

4f

内壳的掺杂离子和其在许多领域的应用。在与传统的氧化物系

发光材料相比，

氟化物是有利的，

因为 由于其低的振动能级和随后的最小化的稀

土离子的激发态猝灭，

并且是荧光基质材料。

因此，

稀土离子掺杂的纳米结构氟

化物已经吸引了广泛的兴趣，

由于其潜在的应用在照明和显示，

上变频器，

磁共

振成像

（

MRI

）

，

生物荧光标记，

光放大器，

透明玻璃，

闪烁晶体，

光子晶体等。

在这些氟化物中，

三氟化镧基质具有光化学稳定性，

生物相容性，

和相对 较低的

结晶温度，它的声子能量低至

350

< br>cm

-1

处。地球离子稀土（铕，铈，铽，钕，铒，

镨，钬，镱，铥）掺杂三氟化镧纳米粒子，三氟化镧三角形纳米片，和硅涂层，

或有机配体修饰三氟化镧发光纳米粒子已经被报道文献中。

Rare earth ions-doped LaF

3

at nanoscale can be synthesized by using

coprecipitation technique

[11,15]

, single- source precursor (SSP) strategy

[24]

,

polyol

method

[22]

,

and

hydrothermal

method

[27]

.

Veggel

and

coworkers

have systematically investigated the synthesis, surface modification, and

luminescent properties of rare earth ions-doped LaF

3

nanoparticles

[18?21]

.

Using

lanthanide

salts

and

sodium

fluoride

or

ammonium

fluoride

as

starting

materials,

they

synthesized

the

doped

LaF

3

nanoparticles

in

ethanol/water medium at 75?

C by using coprecipitation technique

[28]

. The

role of ethanol as solvent can adjust the solubility of sodium fluoride or

ammonium fluoride in solution and control the growth of the doped LaF

3

particles

[29]

.

However,

the

agglomeration

of

lanthanide-doped

LaF

3

nanocrystals occurs without adding the stabilizer because the nanocrystals

tend to decrease the exposed surface in order to lower the surface energy.

Meanwhile,

the

reaction

temperature

is

about

75?

C

because

of

the

low

boiling

point

(b.p.)

of

ethanol

(~78.4?

C),

which

is

disadvantageous

to

increasing the crystallinity and luminescent intensity of lanthanide-doped

LaF

3

nanoparticles.

稀土离子掺杂可以采用共沉淀技术，单源前驱体（

SSP

）的策略，多元醇法

和水热法合成纳 米级三氟化镧。

Veggel

和他的同事已经系统地研究了合成 ，

表面

改性，

稀土离子掺杂的纳米粒子 和发光性能。

使用镧系元素的盐，

氟化钠或氟化

铵作为起始原料，

合成掺杂纳米粒子在乙醇

/