Transparent Ceramics Enabling High Luminous Flux and Efficacy for the Next-Generation High-Power LED Light

Yongfu Liu; Shuang Liu; Peng Sun; Yuanbao Du; Sheng Lin; Rong-Jun Xie; Rui Dong; Jun Jiang; Haochuan Jiang

doi:10.1021/acsami.9b02703

Transparent Ceramics Enabling High Luminous Flux and Efficacy for the Next-Generation High-Power LED Light

ACS Appl Mater Interfaces. 2019 Jun 19;11(24):21697-21701. doi: 10.1021/acsami.9b02703. Epub 2019 Jun 4.

Authors

Yongfu Liu^{1

2}, Shuang Liu^{1

3}, Peng Sun¹, Yuanbao Du⁴, Sheng Lin⁴, Rong-Jun Xie⁵, Rui Dong¹, Jun Jiang¹, Haochuan Jiang¹

Affiliations

¹ Ningbo Institute of Materials Technology and Engineering , Chinese Academy of Sciences , Ningbo 315201 , P. R. China.
² University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.
³ Nano Science and Technology Institute , University of Science and Technology of China , Suzhou 215123 , P. R. China.
⁴ Ningbo Sunpu-Opto Semiconductor Co. Ltd. , Ningbo , 315000 , P. R. China.
⁵ College of Materials , Xiamen University , Xiamen 361005 , P. R. China.

PMID: 31117431
DOI: 10.1021/acsami.9b02703

Abstract

By designing novel chemical compositions and controlling precursor powders, perfect transparent ceramics (TCs) of Gd₃Al₄GaO₁₂:2%Ce³⁺ garnets (GAGG:2%Ce³⁺) were achieved for the first time. Ce³⁺ distributions in ceramics were revealed by micromorphology and micro-cathodoluminescence. Benefiting from the components that are rich in red emission, warm light with a correlated color temperature of about 2800 K was generated when TC was used in high-power (hp) blue light emitting diodes (LEDs) (∼450 nm, ∼34 W driven at 1 A). The hp LED device shows high brightness with a luminous flux nearly 2100 lm. The luminous efficacy even reaches 388 lm/W, which is the highest value reported till now, indicating that the use of GAGG:2%Ce³⁺ TCs promises energy saving. We believe that this work will open a new perspective to develop TCs for next-generation hp LED lighting to substitute traditional hp xenon lamps and high-pressure sodium lamps.

Keywords: Ce luminescence; garnet; high-power LED; transparent ceramic; warm light.