2026-10-14T01:34:32Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34044486 2026-10-01T11:17:58Z category_4 category_146 category_915 category_7 category_873 category_734 category_133 portal_63 item_type_6 month_year_10_2026

Coupling Photonic Bandgap Engineering with Photochromism for Upconversion Luminescence Modulation Yuhuan Li (337260) Anjun Huang (5108054) Xinhao Cai (20778571) Heping Zhao (671708) Yingzhu Zi (15305739) Xue Bai (129175) Yue Liu (292931) Yangke Cun (4808202) Zhiguo Song (154070) Jianbei Qiu (1431598) Peng Ren (337555) Zhengwen Yang (1480510) Biochemistry Space Science Physical Sciences not elsewhere classified Medicine Chemical Sciences not elsewhere classified Biological Sciences not elsewhere classified Plant Biology readable optical patterns polaron hopping associated nonselective intensity modulation enhanced upconversion luminescence containing precursor sols concealed information writing advanced optical encryption 980 nm laser ordered photonic architectures adaptive photonic devices selective luminescence modulation green emission ratio color masking effect induced photochromism originates induced luminescence regulation distinct structural colors 5 +</ sup 3 +</ sup photonic bandgap selective inhibition synergistic effect reabsorption effect work provides valence states usually governed sequentially introduced reversible route oxygen vacancy emission bands effective strategy conventional photochromism avoid precipitation Reversible and wavelength-selective luminescence modulation is essential for advanced optical encryption, anticounterfeiting, and adaptive photonic devices. However, conventional photochromism-induced luminescence regulation is usually governed by a reabsorption effect, leading to nonselective intensity modulation. Herein, PbWO₄:Yb³⁺/Er³⁺ inverse opal photonic crystals were fabricated through a template-assisted stepwise infiltration strategy, in which W- and Pb-containing precursor sols were sequentially introduced to avoid precipitation and ensure the formation of ordered photonic architectures. The obtained PbWO₄:Yb³⁺/Er³⁺ inverse opals exhibit tunable photonic stop-bands and distinct structural colors. By matching the photonic bandgap with Er³⁺ emission bands, wavelength-selective inhibition and band-edge-enhanced upconversion luminescence were achieved, enabling the regulation of the red-to-green emission ratio. X-ray-induced photochromism originates from the synergistic effect of oxygen vacancy-related color center formation and polaron hopping associated with W⁶⁺/W⁵⁺ mixed-valence states, providing a reversible route for overall emission intensity modulation. Benefiting from the structural-color masking effect and coloration-induced upconversion luminescence modulation, concealed information writing and 980 nm laser-readable optical patterns were demonstrated. This work provides an effective strategy for integrating photonic bandgap engineering with photochromism toward upconversion luminescence modulation and advanced optical anticounterfeiting applications. 2026-10-01T00:00:00Z Text Journal contribution 10.1021/acs.chemmater.6c02176.s001 https://figshare.com/articles/journal_contribution/Coupling_Photonic_Bandgap_Engineering_with_Photochromism_for_Upconversion_Luminescence_Modulation/34044486 CC BY-NC 4.0