title: A zero-thermal-quenching phosphor.
abstract: Phosphor-converted white light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. One of the most significant challenges of pc-WLEDs is the thermal quenching, in which the phosphor suffers from emission loss with increasing temperature during high-power LED operation. Here, we report a blue-emitting Na3-2xSc2(PO4)3:xEu2+phosphor (λem= 453 nm) that does not exhibit thermal quenching even up to 200 °C. This phenomenon of zero thermal quenching originates from the ability of the phosphor to compensate the emission losses and therefore sustain the luminescence with increasing temperature. The findings are explained by polymorphic modification and possible energy transfer from electron-hole pairs at the thermally activated defect levels to the Eu2+5d-band with increasing temperature. Our results could initiate the exploration of phosphors with zero thermal quenching for high-power LED applications.
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Yoon Hwa
authors.initials: YH
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Paulraj
authors.identifier: 0000-0002-9308-085X
authors.initials: P
authors.lastname: Arunkumar
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Bo Young
authors.initials: BY
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Sanjith
authors.initials: S
authors.lastname: Unithrattil
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Eden
authors.initials: E
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Su-Hyun
authors.initials: SH
authors.lastname: Moon
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.|Lighting Sources and Materials Team, Korea Photonics Technology Institute (KOPTI), 9 Cheomdan venture-ro 108beon-gil, Buk-gu, Gwangju 61007, Republic of Korea.
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Hyun
authors.affiliation: Lighting Sources and Materials Team, Korea Photonics Technology Institute (KOPTI), 9 Cheomdan venture-ro 108beon-gil, Buk-gu, Gwangju 61007, Republic of Korea.
authors.forename: Ki Hyun
authors.initials: KH
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Donghwa
authors.identifier: 0000-0002-8956-3648
authors.initials: D
authors.lastname: Lee
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Jong-Sook
authors.initials: JS
authors.lastname: Lee
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Won Bin
authors.identifier: 0000-0003-2473-4714
authors.initials: WB
authors.lastname: Im