Advances in Phosphor-in-Glass for White LED

doi:10.15541/jim20160269

Abstract

Abstract:

Duo to the unique luminescent property, thermal conductivity and chemical stability, phosphors/glass composite (Phosphor-in-Glass, PiG) has a huge market application prospect as an alternative to silicon-based phosphor converter for conventional white LEDs, as well as a solution to the heat emission, luminous efficiency, quality, glare, lifetime and other technical problems at the same time. Herein, some key scientific topics in terms of PiG materials were analyzed, such as luminescence properties, transparency, mechanical strength, and mass production; the targeted optimization measures were also comprehensively summarized, including preparation methods (tabletting sintering, melt quenching, and film sintering), material composition design, and the structure optimization of phosphor layers. Generally, this review presents the most recent advances of excellent performance PiG materials, and also prospects their research trend.

Key words: white LEDs, phosphor-in-glass, performance optimization, review

CLC Number:

TQ174

ZHANG Rui, Wang Bo-Yang, WANG Hai. Advances in Phosphor-in-Glass for White LED[J]. Journal of Inorganic Materials, 2017, 32(4): 337-345.

Figures/Tables 6

Fig. 1 Comparative structural schematic diagrams of SMT typed high powered white LEDs(a) Traditional organic resin based[4]; (b) Glass ceramic based[5-8]

Fig. 2 Transmittance spectra (a) and SEM image (b) of PiG samples, emission spectra of PiG based LED with different YAG contents or thicknesses (c), and thermal-quenching results of WLEDs with PiGs or commercial silicone resin (d)[16-18]

Fig. 3 Photographs of PiG prepared via different conditions (a), the images and emission spectra of different thicked PiG based LED (b), and the temperature dependent and heat resistance test for PiG and PiS (c)[31]

Fig. 4 Optical microstructure of PiG (a), normalized emission spectra (b) and CIE color coordinate (c) of PiG based LED with different phosphor thicknesses[39]

Table 1 Glass matrix, phosphors and their luminescent color

Precursor glass composition	Phosphors	References
SiO₂-R₂O₃-R’O-R”₂O (R = B, Al, La), (R’ = Zn, Ca, Ba), (R” = Li, K)	Ce³⁺:Lu₃Al₅O₁₂ (green) Eu²⁺: SrGa₂S₄ (green) Ce³⁺: YAG (yellow) Eu²⁺: CaAlSiN₃ (red)	[14, 16-23, 26, 44, 45-47]
B₂O₃-R₂O₃-ZnO-K₂O (R = Bi, Al, Sb)	Ce³⁺: YAG (yellow) Eu²⁺: (Ba,Sr,Ca)₂SiO₄(yellow) Eu²⁺: CaAlSiN₃ (red)	[25, 34-35, 40-41]
TeO₂-R₂O₃-ZnO-R”₂O (R = B, Bi, Al, Sb) (R” = Na, K)	Ce³⁺: YAG (yellow) Ce³⁺, Mn²⁺, Si⁴⁺: YAG (orange)	[27-28, 31-33, 36]
SiO₂-B₂O₃-PbO-ZnO	Ce³⁺: YAG (yellow)	[24, 37-39, 42, 46]
P₂O₅-R’O (R’= Zn, Ca, Ba)	Eu²⁺: Ca-α-SiAlON (yellow)	[29]
Nano SiO₂or B₂O₃	Eu²⁺: Ca-α-SiAlON (yellow)	[30]

Fig. 5 (a) EL spectra of reference and multi-PiGs mounted on a remote-type configuration[14], (b) measurements of angular color distributions of LEDs with different layer cone-shaped PiG[46], and (c) interaction between phosphor and blue light based on the mean scattering length and scattering type[47]

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