Enhancing luminous flux and color rendering of laser-excited YAG:Ce3+ single crystal phosphor plate via surface roughening and low-temperature sintering a CaAlSiN3:Eu2+ phosphor-in-borate glass

Title

Enhancing luminous flux and color rendering of laser-excited YAG:Ce3+ single crystal phosphor plate via surface roughening and low-temperature sintering a CaAlSiN3:Eu2+ phosphor-in-borate glass

 Author

Wei Chen, Chen (Fudan University; Changzhou Institute of Technology Research for Solid State Lighting)
Cao, Dunhua (Nanjing Crylink Photonics Co, Nanjing)
Dong, Yongjun (Nanjing Crylink Photonics Co, Nanjing)
Xiong, Jingkang (Changzhou Institute of Technology Research for Solid State Lighting)
Trofimov, Yuri (Center of LED and Optoelectronic Technologies of NAS Belarus, Minsk)
Lishik, Sergey (Center of LED and Optoelectronic Technologies of NAS Belarus, Minsk)
Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials) ORCID 0000-0002-8023-5170
Fan, J. (TU Delft Electronic Components, Technology and Materials; Fudan University; Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences; Changzhou Institute of Technology Research for Solid State Lighting) ORCID 0000-0001-5400-737X

 Date

2022

 Abstract

Y3Al5O12:Ce3+ (YAG:Ce3+) single crystal phosphor (SCP) exhibits high internal quantum efficiency (IQE) and excellent thermal conductivity and stability. Such properties are promising in high-power laser-excited white lighting applications. However, YAG:Ce3+ SCP usually shows low luminous flux and color rendering index (CRI, Ra) when excited by a transmissive laser. In this study, a self-designed three-integrating sphere system was established to characerize the optical performances of YAG:Ce3+ SCP palates under both the reflective and transmissive 455 nm blue laser excitations. Next, its luminous and color rendering properties under transmissive laser excitation were improved by surface roughening treatment and sintering of a CaAlSiN3:Eu2+ (CASN:Eu2+) phosphor-in-borate glass (PiBG) layer. The results revealed that: (1) When the YAG:Ce3+ SCP was excited by blue laser, its forward luminous flux was considerably lower than the backward one; (2) Under transmissive excitation, its luminous flux rolled up with the maximum increase rate of 109.19% when the averaged roughness (Ra) increased from 0.35 to 5.40 μm; (3) After sintering the CASN:Eu2+ PiBG layer on the roughening YAG:Ce3+ SCP, its luminous flux, CRI increased by 31.48% and 117.14%, and its color fidelity index (CFI, Rf) reached up to 82 under the transmissive 3.03 W blue laser excitation.


 Subject

High color rendering
Phosphor-in-borate glass
Surface roughening
White laser lighting
YAG single Crystal

 To reference this document use:

http://resolver.tudelft.nl/uuid:05da91c0-2957-40eb-896c-e6b9b58e5cb3

 DOI

https://doi.org/10.1016/j.jlumin.2022.119225

 Embargo date

2023-07-01

 ISSN

0022-2313

 Source

Journal of Luminescence, 251

 Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2022 Chen Wei Chen, Dunhua Cao, Yongjun Dong, Jingkang Xiong, Yuri Trofimov, Sergey Lishik, Kouchi Zhang, J. Fan
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