Ukrainian Journal of Physical Optics


2026 Volume 27, Issue 1


ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

JUDD-OFELT ANALYSIS AND CONCENTRATION-DEPENDENT LUMINESCENCE QUENCHING BEHAVIOR OF Dy3+-DOPED NaYGeO4 PHOSPHORS PREPARED BY SOLID-STATE REACTION

Shengyi Liu, Duan Gao, Jiade Dong, Han Yin, Haoyu Liu, Li Wang and Wenbin Song

Author Information
1Shengyi Liu SCOPUS logo, 2Duan Gao SCOPUS logo, 1Jiade Dong, 1Han Yin, 1Haoyu Liu, 1Li Wang SCOPUS logo, 1Wenbin Song SCOPUS logo
1School of Intelligence and Electronic Engineering, Dalian Neusoft University of Information, Dalian, Liaoning 116026, China
2Department of Public Security Management, Liaoning Police College, Dalian, Liaoning 116036, China
*Corresponding author: liushengyi@neusoft.edu.cn


ABSTRACT

In this study, a series of NaYGeO4 (NYG): Dy3+ phosphors with varying Dy3+ doping concentrations were successfully synthesized via a conventional high-temperature solid-state reaction method. X-ray diffraction analysis confirmed that all samples exhibited a pure NYG phase with no detectable secondary phases. To systematically investigate the concentration quenching behavior and thermal stability of luminescence, the photoluminescence properties of the samples were comprehensively characterized. In addition, diffuse reflectance spectra, fluorescence decay measurements, and Judd-Ofelt theory were employed to gain deeper insight into the optical transition characteristics of Dy3+ ions. The results indicate that the internal quantum efficiency of the Dy3+ 4F9/2 level gradually decreases with increasing dopant concentration.

Keywords: luminescence, Judd-Ofelt theory, NaYGeO4, phosphors

UDC: 535.37

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    У цьому дослідженні серію люмінофорів NaYGeO4 (NYG): Dy3++ з різною концентрацією легувальної домішки Dy3++ було успішно синтезовано за допомогою звичайного методу високотемпературної твердофазної реакції. Рентгенівський дифракційний аналіз підтвердив, що всі зразки демонстрували чисту фазу NYG без виявлених вторинних фаз. Для систематичного дослідження поведінки концентраційного гасіння та термічної стабільності люмінесценції було всебічно схарактеризувано властивості фотолюмінесценції зразків. Крім того, для глибшого розуміння характеристик оптичних переходів іонів Dy3++ були використані спектри дифузного відбиття, вимірювання флуоресцентного спаду та теорію Джадда-Офельта. Результати показують, що внутрішня квантова ефективність рівня Dy3+ 4F9/2 поступово зменшується зі збільшенням концентрації легувальної домішки.

    Ключові слова: люмінесценція, теорія Джадда-Офельта, NaYGeO4, люмінофори

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