合成与应用：Ba7Zr(PO4)6:Eu2+黄光荧光粉的发光性能与白光LED研究

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本研究论文探讨了Ba7Zr(PO4)6:Eu2+荧光粉的合成、发光特性和在白光二极管应用中的潜力。Ba7Zr(PO4)6是一种新型的黄光发射材料，其核心是Eu2+离子，这是一种重要的稀土元素，因其在可见光区的高效率激发和稳定的发光性能而备受关注。合成部分，作者采用固体相反应法成功制备了Ba7Zr(PO4)6:Eu2+荧光粉。这种方法通过控制温度和反应时间，使原料之间的化学反应在固态下进行，从而形成具有优良结构和性能的产物。研究表明，这种合成过程对原料纯度和反应条件有较高的要求，以确保最终产物的均匀性和稳定性。发光性能方面，Ba7Zr(PO4)6:Eu2+表现出强烈的近紫外(n-UV)吸收特性，这与通常用于激发黄光的n-UV芯片匹配良好。当受到370纳米的激发光照射时，该荧光粉呈现出宽广的黄光发射带，峰值位于585纳米，且半宽度全最大值达到178纳米，这一特性明显优于商业上常用的YAG:Ce3+黄光发射磷光体，显示出更高的发光效率和更宽的色域。浓度猝灭机制也是研究的重点，即随着Eu2+离子浓度的增加，可能会出现光致发光效率降低的现象。然而，作者通过优化掺杂浓度，可能找到了一个平衡点，使得在一定范围内，荧光粉的发光性能保持在较高水平。对于白光二极管应用而言，Ba7Zr(PO4)6:Eu2+作为黄光发射材料，能够与蓝光或绿光荧光粉相结合，实现高效的白光光源。由于其良好的颜色匹配和稳定的发光特性，这种新型黄光磷光体有望提高白光LED的色温和显色指数，从而改善照明设备的整体性能。这篇论文不仅提供了Ba7Zr(PO4)6:Eu2+荧光粉的详细合成方法，还深入探讨了其在实际应用中的优势和潜在改进方向，对于磷光材料的研究和白色LED技术的发展具有重要的理论和实践价值。

Synthesis, luminescent properties and white light emitting diode

application of Ba

Zr(PO

)

:Eu

2þ

yellow-emitting phosphor

Chenxia Li

, Jian Dai

, Degang Deng

, Changyu Shen

, Shiqing Xu

College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China

College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China

article info

Article history:

Received 29 May 2015

Received in revised form

28 June 2015

Accepted 29 June 2015

Available online 2 July 2015

Keywords:

Zr(PO

)

:Eu

2þ

Phosphors

White LEDs

Luminescence

abstract

A yellow-emitting phosphor, Eu

2þ

-activated Ba

Zr(PO

)

phosphor was synthesized by solid-state re-

action method and the luminescence properties were investigated. The phosphor exhibited strong ab-

sorption in near ultraviolet (n-UV) region, which matched well with the n-UV chip. Upon excitation at

370 nm, the Ba

Zr(PO

)

:Eu

2þ

phosphor has a broad yellow emission band with a peak at 585 nm and a

full width at half maximum of 178 nm wider than that of the commercial yellow-emitting YAG:Ce

3þ

phosphor. The mechanism of concentration quenching of Eu

2þ

ions in Ba

Zr(PO

)

phosphor is veriﬁed

to be energy transfer among the nearest neighbor Eu

2þ

ions. The CIE value and temperature dependence

of photoluminescence were also discussed. Furthermore, a white-LED was fabricated using a 370 nm UV

chip pumped with a blend of phosphors consisting of yellow-emitting Ba

6.97

Zr(PO

)

:0.03Eu

2þ

and blue-

emitting BaMgAl

:Eu

2þ

phosphors, which achieved a CIE of (0.3329, 0.3562) with a color-rendering

index of 86.4 around the CCT of 5487 K.

1. Introduction

Compared to conventional lighting sources, white light-emit-

ting diodes (LEDs) have more advantages such as energy-saving,

compactness, long operational lifetime and environmentally be-

nign, and so far they have been attracted much attention [1,2].

From the viewpoint of fabrication, white LEDs can be synthesized

in three ways: (a) a combination of red, green, and blue-emitting

LED chips; (b) a combination of a blue LED chip with a yellow-

emitting phosphor (such as YAG:Ce

3þ

); (c) a blend of multicolor-

emitting phosphors excited by near ultraviolet chips [3]. The way

(a) has the disadvantages that individual colored LEDs responds

differently to drive current, operating temperature and the con-

trols needs for color consistency add expense. As to the way (b),

the fabricated LED always results in a low color rendering index

and a high correlated color temperature due to the deﬁciency of

red spectrum component in the phosphor. While the way (c) can

obtain a stable emission color and good color rendering index

[4,5]. Therefore, developing new multicolor-emitting phosphors

that can be effectively excited by n-UV light is critically important.

Among them, yellow-emitting phosphors have played a key role in

the fabrication of white LEDs and become a research hotspot.

Hence, many novel yellow-emitting phosphors excited by n-UV

light have been reported, such as Ba

Gd(BO

)

Cl:Eu

2þ

[6],

NaScSi

:Eu

2þ

[7],Sr

1.75

1.25

(PO

)

:Eu

2þ

[8],Y

(CN

)

:Ce

3þ

[9]

and NaZnPO

:Mn

2þ

[10].

Phosphate-based phosphors have emerged as an excellent lu-

minescence materials because of environment benign, stable

physical and chemistry properties, cheap starting materials and

high brightness [11]. The Eu

2þ

ions, as one of the most widely

used activators in phosphors, have been extensively studied.

2þ

-doped phosphors have a broad excitation band covering the

emissions from the n-UV chips and a broad emission band ranging

from blue region to red region due to the parity-allowed 4f–5d

transitions. Thus, Eu

2þ

-doped phosphate phosphors have been

proved to be a promising material for application in white LEDs,

Such as Eu

2þ

-doped Ca

(PO

)

O red-emitting phosphor [12],

2þ

-doped Ca

BaP

yellow-emitting phosphor [13] and

2þ

-doped RbBaPO

blue-emitting phosphor [14]. As we known,

eulytite compound with the general formula M

Zr(PO

)

(M¼ Ca,

Sr, Ba) have a cubic structure with space group of I-43d(220). The

structure has a three-dimensional network formed by mixed

metal (Ba/Zr)–oxygen octahedra connected by edge sharing and

forming corrugated chains. The octahedra are additionally linked

by independent PO

tetrahedra groups by sharing corners [15].

Such a structure is favorable to be a luminescent material. For

example, Qin et al. have concluded that M

Zr(PO

)

(M¼ Ca, Sr, Ba)

is an unusual self-activated luminescence compound, due to the

4þ

to O

2

charge transfer transitions [16], Zhang et al. have

reported the photoluminescence properties of Sr

Zr(PO

)

:Eu

3þ

Contents lists available at ScienceDirect

journal homepage: www.elsevier.com/locate/physb

Physica B

http://dx.doi.org/10.1016/j.physb.2015.06.027

Corresponding authors.

E-mail addresses: dengdegang@cjlu.edu.cn (D. Deng), sxucjlu@163.com (S. Xu).

Physica B 475 (2015) 105–109

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