Enhancement of red spectral emission intensity of Y3Al5O12:Ce3+ phosphor via Pr co-doping and Tb substitution for the application to white LEDs

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2007-10-01 DOI:10.1016/j.jlumin.2006.08.093

Ho Seong Jang , Won Bin Im , Dong Chin Lee , Duk Young Jeon , Shi Surk Kim

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引用次数: 488

Abstract

We have enhanced color-rendering property of a blue light emitting diode (LED) pumped white LED with yellow emitting Y₃Al₅O₁₂:Ce³⁺ (YAG:Ce) phosphor using addition of Pr and Tb as a co-activator and host lattice element, respectively. Pr³⁺ addition to YAG:Ce phosphor resulted in sharp emission peak at about 610 nm through ¹D₂→³H₄ transition. And when Tb³⁺ substituted Y³⁺ sites, Ce³⁺ emission band shifted to a longer wavelength due to larger crystal field splitting. Y₃Al₅O₁₂:Ce³⁺, Pr³⁺ and (Y₁₋_xTb_x)₃Al₅O₁₂:Ce³⁺ phosphors were coated on blue LEDs to fabricate white LEDs, respectively, and their color-rendering indices (CRIs, R_a) were measured. As a consequence of the addition of Pr³⁺ or Tb³⁺, CRI of the white LEDs improved to be $R_{a} = 83$ and 80, respectively. Especially, blue LED pumped (Y_0.2Tb_0.8)₃Al₅O₁₂:Ce³⁺ white LED showed both strong luminescence and high color-rendering property.

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通过Pr共掺杂和Tb取代增强Y3Al5O12:Ce3+荧光粉在白光led中的应用

本文研究了以Y3Al5O12:Ce3+ (YAG:Ce)为荧光粉的蓝色发光二极管(LED)泵浦白光LED的显色性能，并分别添加Pr和Tb作为辅激活剂和主晶格元素。Pr3+加入YAG:Ce荧光粉后，通过1D2→3H4跃迁，在约610 nm处产生了明显的发射峰。当Tb3+取代Y3+时，由于晶体场分裂较大，Ce3+发射带向更长的波长偏移。将Y3Al5O12:Ce3+、Pr3+和(Y1−xTbx)3Al5O12:Ce3+荧光粉分别涂覆在蓝色led上制备白光led，并测量其显色指数(CRIs, Ra)。由于Pr3+或Tb3+的加入，白光led的显色指数分别提高到Ra=83和80。特别是泵浦的(Y0.2Tb0.8)3Al5O12:Ce3+白光LED，具有较强的发光性和较高的显色性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.