Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Novel broadband glass phosphors for high CRI WLEDs

Open Access Open Access

Abstract

New broadband glass phosphors with excellent thermal stability were proposed and experimentally demonstrated for white light-emitting-diodes (WLEDs). The novel glass phosphors were realized through dispersing multiple phosphors into SiO2 based glass (SiO2-Na2O-Al2O3-CaO) at 680°C. Y3Al5O12:Ce3+ (YAG), Lu3Al5O12:Ce3+ (LuAG), and CaAlSiN3: Eu2+ (nitride) phosphor crystals were chosen respectively as the yellow, green, and red emitters of the glass phosphors. The effect of sintering temperature on inter-diffusion reduction between phosphor crystals and amorphous SiO2 in nitride-doped glass phosphors was studied and evidenced by the aid of high-resolution transmission electron microscopy (HRTEM). Broadband glass phosphors with high quantum-yield of 55.6% were thus successfully realized through the implementation of low sintering temperature. Proof-of-concept devices utilizing the novel broadband phosphors were developed to generate high-quality cool-white light with trisstimulus coordinates (x, y) = (0.358, 0.288), color-rending index (CRI) = 85, and correlated color temperature (CCT) = 3923K. The novel broadband glass phosphors with excellent thermal stability are essentially beneficial to the applications for next-generation solid-state indoor lighting, especially in the area where high power and absolute reliability are required.

© 2014 Optical Society of America

Full Article  |  PDF Article
More Like This
High color rendering index of 94 in white LEDs employing novel CaAlSiN3: Eu2+ and Lu3Al5O12: Ce3+ co-doped phosphor-in-glass

Hsing-Kun Shih, Chun-Nien Liu, Wei-Chih Cheng, and Wood-Hi Cheng
Opt. Express 28(19) 28218-28225 (2020)

Chromaticity tailorable glass-based phosphor-converted white light-emitting diodes with high color rendering index

Li-Yin Chen, Jin-Kai Chang, Wei-Chih Cheng, Jhih-Ci Huang, Yi-Chung Huang, and Wood-Hi Cheng
Opt. Express 23(15) A1024-A1029 (2015)

High-performance glass phosphor for white-light-emitting diodes via reduction of Si-Ce3+:YAG inter-diffusion

Li-Yin Chen, Wei-Chih Cheng, Chun-Chin Tsai, Yi-Chung Huang, Yen-Sheng Lin, and Wood-Hi Cheng
Opt. Mater. Express 4(1) 121-128 (2014)

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)

Fig. 1
Fig. 1 Flow chart of preparing glass phosphors.
Fig. 2
Fig. 2 QYint and the images of YDG, GDG and RDG with different sintering temperature.
Fig. 3
Fig. 3 DTA curve of CaAlSiN3: Eu2+ glass phosphor precursor.
Fig. 4
Fig. 4 XRD patterns of CaAlSiN3: Eu2+, RDG-680, RDG-700, and RDG-750.
Fig. 5
Fig. 5 HRTEM images of (a) RDG-680, (b) RDG-700, and (c) RDG-750.
Fig. 6
Fig. 6 Fluorescence spectra of YDG and YGRDG.

Tables (2)

Tables Icon

Table 1 Optical Properties of Glass Phosphors and the WLEDs Utilizing the Glass Phosphors

Tables Icon

Table 2 Change of Optical Properties of YGRDG, MPDS and the Resulting WLEDs after Thermal Stressing

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

R a = 1 8 i=1 8 R i ; R i =1004.6Δ E i ,
Q Y int Loss=Q Y i Q Y f ,
CRIattenuatio=R a i R a f ,
Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved